[macOS] App CLI is not executable Error: EACCES: permission denied

[lewisl]

Description

All I do is double-click on the app to start it and then click on new session. Naturally, it fails with "Failed to create session!" and Error:Jupyter Server process terminated before the initialization completed.

Reproduce

1. Go to '...'
2. Click on '...'
3. Scroll down to '...'
4. See error '...'

Expected behavior

it should work.

Context

• Operating System and version: MacOS Sequoia 15.3.2
• JupyterLab-Desktop version: 4.2.5-1
• Installer: .dmg

Here is the output of trying to launch from the command line. Naturally, us dumb users can't make hide nor tail of this:

Last login: Thu Mar 20 08:27:25 on ttys001
➜ ~ python -m jupyterlab --no-browser --expose-app-in-browser
[I 2025-03-20 15:45:10.052 ServerApp] jupyter_lsp | extension was successfully linked.
[I 2025-03-20 15:45:10.053 ServerApp] jupyter_server_terminals | extension was successfully linked.
[I 2025-03-20 15:45:10.055 ServerApp] jupyterlab | extension was successfully linked.
[W 2025-03-20 15:45:10.056 JupyterNotebookApp] 'ip' has moved from NotebookApp to ServerApp. This config will be passed to ServerApp. Be sure to update your config before our next release.
[W 2025-03-20 15:45:10.056 JupyterNotebookApp] 'max_buffer_size' has moved from NotebookApp to ServerApp. This config will be passed to ServerApp. Be sure to update your config before our next release.
[W 2025-03-20 15:45:10.056 JupyterNotebookApp] 'password_required' has moved from NotebookApp to ServerApp. This config will be passed to ServerApp. Be sure to update your config before our next release.
[W 2025-03-20 15:45:10.057 ServerApp] ServerApp.password_required config is deprecated in 2.0. Use PasswordIdentityProvider.password_required.
[I 2025-03-20 15:45:10.057 ServerApp] notebook | extension was successfully linked.
[I 2025-03-20 15:45:10.206 ServerApp] notebook_shim | extension was successfully linked.
[I 2025-03-20 15:45:10.225 ServerApp] notebook_shim | extension was successfully loaded.
[I 2025-03-20 15:45:10.226 ServerApp] jupyter_lsp | extension was successfully loaded.
[I 2025-03-20 15:45:10.227 ServerApp] jupyter_server_terminals | extension was successfully loaded.
[I 2025-03-20 15:45:10.228 LabApp] JupyterLab extension loaded from /Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/jupyterlab
[I 2025-03-20 15:45:10.228 LabApp] JupyterLab application directory is /Library/Frameworks/Python.framework/Versions/3.13/share/jupyter/lab
[I 2025-03-20 15:45:10.229 LabApp] Extension Manager is 'pypi'.
[I 2025-03-20 15:45:10.261 ServerApp] jupyterlab | extension was successfully loaded.
[I 2025-03-20 15:45:10.263 ServerApp] notebook | extension was successfully loaded.
[I 2025-03-20 15:45:10.263 ServerApp] Serving notebooks from local directory: /Users/lewis
[I 2025-03-20 15:45:10.263 ServerApp] Jupyter Server 2.15.0 is running at:
[I 2025-03-20 15:45:10.263 ServerApp] http://127.0.0.1:8888/lab
[I 2025-03-20 15:45:10.263 ServerApp] http://127.0.0.1:8888/lab
[I 2025-03-20 15:45:10.263 ServerApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
[I 2025-03-20 15:45:13.749 ServerApp] Skipped non-installed server(s): bash-language-server, dockerfile-language-server-nodejs, javascript-typescript-langserver, jedi-language-server, julia-language-server, pyright, python-language-server, python-lsp-server, r-languageserver, sql-language-server, texlab, typescript-language-server, unified-language-server, vscode-css-languageserver-bin, vscode-html-languageserver-bin, vscode-json-languageserver-bin, yaml-language-server

I can run jupyter lab in a shell and the browser version launches correctly when the browser preference is set manually in jupyter_notebook_config.py as:

c.NotebookApp.browser = u'open -a /Applications/Thorium.app %s'
c.ServerApp.browser = u'open -a /Applications/Thorium.app %s'

This is necessary because jupyter can no longer launch in Safari 18.3 unless one manually changes the url place http:// ahead of the launch url at 127.0.0.1:8888/lab or localhost:8888/lab.

Troubleshoot Output

Paste the output from running `jupyter troubleshoot` from the terminal inside of JupyterLab Desktop here.
You may want to sanitize the paths in the output.
I can't do that because JLD never runs starts a session, I think.
I can connect to the jupyter server I started in a browser, enter the password (this is one way to solve the https issue in safari, but is otherwise inconvenient and seems unnecessary, so I'll end up removing the password.
OK, here you ....
jupyter troubleshoot
$PATH:
        /Users/lewis/nim-2.0.8/bin
        /Applications/Racket v8.10/bin
        /Users/lewis/.local/bin
        /Users/lewis/nim-2.0.8/bin
        /Applications/Racket v8.10/bin
        /Library/Frameworks/Python.framework/Versions/3.13/bin
        /opt/homebrew/bin
        /opt/homebrew/sbin
        /usr/local/bin
        /Users/lewis/.nimble/bin
        /System/Cryptexes/App/usr/bin
        /usr/bin
        /bin
        /usr/sbin
        /sbin
        /var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin
        /var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin
        /var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin
        /opt/X11/bin
        /Library/Apple/usr/bin
        /Library/TeX/texbin
        /usr/local/go/bin

sys.path:
        /Library/Frameworks/Python.framework/Versions/3.13/bin
        /Library/Frameworks/Python.framework/Versions/3.13/lib/python313.zip
        /Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13
        /Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/lib-dynload
        /Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages

sys.executable:
        /Library/Frameworks/Python.framework/Versions/3.13/bin/python3.13

sys.version:
        3.13.2 (v3.13.2:4f8bb3947cf, Feb  4 2025, 11:51:10) [Clang 15.0.0 (clang-1500.3.9.4)]

platform.platform():
        macOS-15.3.2-arm64-arm-64bit-Mach-O

which -a jupyter:
        /Library/Frameworks/Python.framework/Versions/3.13/bin/jupyter

pip list:
        Package                   Version
        ------------------------- --------------
        anyio                     4.9.0
        appnope                   0.1.4
        argon2-cffi               23.1.0
        argon2-cffi-bindings      21.2.0
        arrow                     1.3.0
        asttokens                 3.0.0
        async-lru                 2.0.5
        attrs                     25.3.0
        babel                     2.17.0
        beautifulsoup4            4.13.3
        bleach                    6.2.0
        certifi                   2025.1.31
        cffi                      1.17.1
        charset-normalizer        3.4.1
        comm                      0.2.2
        debugpy                   1.8.13
        decorator                 5.2.1
        defusedxml                0.7.1
        executing                 2.2.0
        fastjsonschema            2.21.1
        filelock                  3.18.0
        fqdn                      1.5.1
        fsspec                    2025.3.0
        h11                       0.14.0
        httpcore                  1.0.7
        httpx                     0.28.1
        idna                      3.10
        ipykernel                 6.29.5
        ipython                   9.0.2
        ipython_pygments_lexers   1.1.1
        ipywidgets                8.1.5
        isoduration               20.11.0
        jedi                      0.19.2
        Jinja2                    3.1.6
        json5                     0.10.0
        jsonpointer               3.0.0
        jsonschema                4.23.0
        jsonschema-specifications 2024.10.1
        jupyter                   1.1.1
        jupyter_client            8.6.3
        jupyter-console           6.6.3
        jupyter_core              5.7.2
        jupyter-events            0.12.0
        jupyter-lsp               2.2.5
        jupyter_server            2.15.0
        jupyter_server_terminals  0.5.3
        jupyterlab                4.3.6
        jupyterlab_pygments       0.3.0
        jupyterlab_server         2.27.3
        jupyterlab_widgets        3.0.13
        MarkupSafe                3.0.2
        matplotlib-inline         0.1.7
        mistune                   3.1.3
        mpmath                    1.3.0
        nbclient                  0.10.2
        nbconvert                 7.16.6
        nbformat                  5.10.4
        nest-asyncio              1.6.0
        networkx                  3.4.2
        notebook                  7.3.3
        notebook_shim             0.2.4
        numpy                     2.2.4
        overrides                 7.7.0
        packaging                 24.2
        pandocfilters             1.5.1
        parso                     0.8.4
        pexpect                   4.9.0
        pillow                    11.1.0
        pip                       25.0.1
        platformdirs              4.3.7
        prometheus_client         0.21.1
        prompt_toolkit            3.0.50
        psutil                    7.0.0
        ptyprocess                0.7.0
        pure_eval                 0.2.3
        pycparser                 2.22
        Pygments                  2.19.1
        python-dateutil           2.9.0.post0
        python-json-logger        3.3.0
        PyYAML                    6.0.2
        pyzmq                     26.3.0
        referencing               0.36.2
        requests                  2.32.3
        rfc3339-validator         0.1.4
        rfc3986-validator         0.1.1
        rpds-py                   0.23.1
        Send2Trash                1.8.3
        setuptools                77.0.1
        six                       1.17.0
        sniffio                   1.3.1
        soupsieve                 2.6
        stack-data                0.6.3
        sympy                     1.13.1
        terminado                 0.18.1
        tinycss2                  1.4.0
        torch                     2.6.0
        torchaudio                2.6.0
        torchvision               0.21.0
        tornado                   6.4.2
        traitlets                 5.14.3
        types-python-dateutil     2.9.0.20241206
        typing_extensions         4.12.2
        uri-template              1.3.0
        urllib3                   2.3.0
        wcwidth                   0.2.13
        webcolors                 24.11.1
        webencodings              0.5.1
        websocket-client          1.8.0
        widgetsnbextension        4.0.13

Browser Output (required for interface issues after loading)

Paste the output from the DevTools JavaScript console here, if applicable.

Logs (required for issues with loading, server and startup)

Paste the logs from the `main.log` file here (optionally also from `renderer.log`).
[2025-03-20 15:37:14.342] [error] App CLI is not executable Error: EACCES: permission denied, access '/Applications/JupyterLab.app/Contents/Resources/app/jlab'
    at Object.accessSync (node:fs:262:3)
    at Object. (node:electron/js2c/asar_bundle:2:8579)
    at Object.jlabCLICommandIsSetup (/Applications/JupyterLab.app/Contents/Resources/app.asar/build/out/main/utils.js:643:12)
    at setupJLabCommand (/Applications/JupyterLab.app/Contents/Resources/app.asar/build/out/main/main.js:146:17)
    at App. (/Applications/JupyterLab.app/Contents/Resources/app.asar/build/out/main/main.js:205:9)
[2025-03-20 15:37:14.344] [error] Python path "/Users/lewis/Library/jupyterlab-desktop/jlab_server/bin/python" does not exist.
[2025-03-20 15:37:14.975] [error] Failed to start server Error: Jupyter Server process terminated before the initialization completed
    at ChildProcess. (/Applications/JupyterLab.app/Contents/Resources/app.asar/build/out/main/server.js:295:28)
    at ChildProcess.emit (node:events:514:28)
    at Process.onexit (node:internal/child_process:291:12)
[2025-03-20 15:37:18.230] [error] Failed to start server Error: Jupyter Server process terminated before the initialization completed
    at ChildProcess. (/Applications/JupyterLab.app/Contents/Resources/app.asar/build/out/main/server.js:295:28)
    at ChildProcess.emit (node:events:514:28)
    at Process.onexit (node:internal/child_process:291:12)
[2025-03-20 15:37:18.235] [error] (node:30707) UnhandledPromiseRejectionWarning: TypeError: Cannot read properties of undefined (reading 'protocol')
    at new LabView (/Applications/JupyterLab.app/Contents/Resources/app.asar/build/out/main/labview/labview.js:46:50)
    at SessionWindow._loadLabView (/Applications/JupyterLab.app/Contents/Resources/app.asar/build/out/main/sessionwindow/sessionwindow.js:275:25)
    at SessionWindow._updateContentView (/Applications/JupyterLab.app/Contents/Resources/app.asar/build/out/main/sessionwindow/sessionwindow.js:873:18)
    at IpcMainImpl. (/Applications/JupyterLab.app/Contents/Resources/app.asar/build/out/main/sessionwindow/sessionwindow.js:438:18)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
(Use `JupyterLab --trace-warnings ...` to show where the warning was created)
[2025-03-20 15:37:18.236] [error] (node:30707) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 3)
[2025-03-20 15:42:35.347] [error] Failed to start server Error: Jupyter Server process terminated before the initialization completed
    at ChildProcess. (/Applications/JupyterLab.app/Contents/Resources/app.asar/build/out/main/server.js:295:28)
    at ChildProcess.emit (node:events:514:28)
    at Process.onexit (node:internal/child_process:291:12)
[2025-03-20 15:43:10.098] [error] Failed to start server Error: Jupyter Server process terminated before the initialization completed
    at ChildProcess. (/Applications/JupyterLab.app/Contents/Resources/app.asar/build/out/main/server.js:295:28)
    at ChildProcess.emit (node:events:514:28)
    at Process.onexit (node:internal/child_process:291:12)
[2025-03-20 15:43:28.063] [error] Failed to start server Error: Jupyter Server process terminated before the initialization completed
    at ChildProcess. (/Applications/JupyterLab.app/Contents/Resources/app.asar/build/out/main/server.js:295:28)
    at ChildProcess.emit (node:events:514:28)
    at Process.onexit (node:internal/child_process:291:12)
[2025-03-20 15:43:28.074] [error] (node:30784) UnhandledPromiseRejectionWarning: TypeError: Cannot read properties of undefined (reading 'protocol')
    at new LabView (/Applications/JupyterLab.app/Contents/Resources/app.asar/build/out/main/labview/labview.js:46:50)
    at SessionWindow._loadLabView (/Applications/JupyterLab.app/Contents/Resources/app.asar/build/out/main/sessionwindow/sessionwindow.js:275:25)
    at SessionWindow._updateContentView (/Applications/JupyterLab.app/Contents/Resources/app.asar/build/out/main/sessionwindow/sessionwindow.js:873:18)
    at IpcMainImpl. (/Applications/JupyterLab.app/Contents/Resources/app.asar/build/out/main/sessionwindow/sessionwindow.js:438:18)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
(Use `JupyterLab --trace-warnings ...` to show where the warning was created)
[2025-03-20 15:43:28.074] [error] (node:30784) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 3)
[2025-03-20 15:48:03.148] [error] Failed to start server Error: Jupyter Server process terminated before the initialization completed
    at ChildProcess. (/Applications/JupyterLab.app/Contents/Resources/app.asar/build/out/main/server.js:295:28)
    at ChildProcess.emit (node:events:514:28)
    at Process.onexit (node:internal/child_process:291:12)
[2025-03-20 15:48:07.636] [error] Failed to start server Error: Jupyter Server process terminated before the initialization completed
    at ChildProcess. (/Applications/JupyterLab.app/Contents/Resources/app.asar/build/out/main/server.js:295:28)
    at ChildProcess.emit (node:events:514:28)
    at Process.onexit (node:internal/child_process:291:12)
[2025-03-20 15:48:07.642] [error] (node:30974) UnhandledPromiseRejectionWarning: TypeError: Cannot read properties of undefined (reading 'protocol')
    at new LabView (/Applications/JupyterLab.app/Contents/Resources/app.asar/build/out/main/labview/labview.js:46:50)
    at SessionWindow._loadLabView (/Applications/JupyterLab.app/Contents/Resources/app.asar/build/out/main/sessionwindow/sessionwindow.js:275:25)
    at SessionWindow._updateContentView (/Applications/JupyterLab.app/Contents/Resources/app.asar/build/out/main/sessionwindow/sessionwindow.js:873:18)
    at IpcMainImpl. (/Applications/JupyterLab.app/Contents/Resources/app.asar/build/out/main/sessionwindow/sessionwindow.js:438:18)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
(Use `JupyterLab --trace-warnings ...` to show where the warning was created)
[2025-03-20 15:48:07.642] [error] (node:30974) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 3)
[2025-03-20 16:02:45.247] [warn]  Language pack 'en_US' not installed!

[andrii-i]

Hi @lewisl. Thank you for creating this issue. I've tried installing jupyterlab-desktop on my mac and did not have the same problem. At the same time there is a known issue with permissions in macOS, could you please try steps suggested here https://github.com/jupyterlab/jupyterlab-desktop/blob/master/troubleshoot.md#macos-write-permission-issues?

[lewisl]

So, these instructions are not going to help: 1. I am not using the bundled Python. I am not going to because there is no reason to require a private Python when I have a perfectly good Python already. I am not using Conda installed Python and will not. I am not using the system installed Python. I installed Python myself to: /Library/Frameworks/Python.framework/Versions/3.13/bin/python3. It works perfectly and runs jupyter lab and launches the Jupyterlab in my default browser. I can connect to it the running instance with Jupyterlab app. So, the app itself runs. The app cannot create a session of its own, however. So, all the advice for a bundled Python does not seem to apply. 2. Manage Python Environments seems to show the right environments. It shows 2 venv’s. I don’t manually create venv’s. I find it much too confusing and I don’t need to run different versions of Python with different packages installed, so I only have 1 venv. Jupyterlab app successfully finds it and reports it as: /Library/Frameworks/Python.framework/Versions/3.13/bin/python3. Just like above. The problem might be that jupterlab app sees it but won’t use it. The Manage Python Environment dialog reports that it IS using the default python venv. There is also a directory for “New Python envirionment install directory”: /Users/lewis/Library/jupyterlab-desktop/envs. This directory exists and is empty as it should be. 3. The permissions problem seems to relate to the cli interface to jupterlab app. In the advanced setting tab it reports: “jlab CLI command is ready to use in your system terminal”. Of course, I don’t know why this is even needed unless it’s how the Python instance of jupyter server talks to jupterlab app. Given that I can successfully have the app “talk to” and run an existing server just by pasting in its local url, probably the cli is working if it is used in the way I am guessing. 4. Last thing, I am resetting the permissions for the directory where the app is installed per the instructions even though there doesn’t appear to be any problem with the cli. After doing that, I quit the above mentioned session connecting to an existing jupyter server instance. Launch the app. Start a new session. It fails with “Error: Jupyter Server Process terminated before the initialization completed.” New notebook command fails in the same way. So, it seems that this app must have its own Python. And that I won’t do. So, it would be nice to use this as a faster way to launch and work on Notebooks (and better than the slow VS Code internal implementation of notebooks, though convenient. But, I do have 2 other ways to use Notebooks and jupyterlab. Let me know if there is anything else you’d like me try or whether you even intend the app to work with external Python (but not conda). From: Andrii Ieroshenko ***@***.***> Reply-To: jupyterlab/jupyterlab-desktop ***@***.***> Date: Tuesday, March 25, 2025 at 9:55 AM To: jupyterlab/jupyterlab-desktop ***@***.***> Cc: Lewis Levin ***@***.***>, Mention ***@***.***> Subject: Re: [jupyterlab/jupyterlab-desktop] Never works for me (Issue #888) Hi @lewisl<https://github.com/lewisl>. Thank you for creating this issue. I've tried installing jupyterlab-desktop on my mac and did not have the same problem. At the same time there is a known issue with permissions in macOS, could you please try steps suggested here https://github.com/jupyterlab/jupyterlab-desktop/blob/master/troubleshoot.md#macos-write-permission-issues? — Reply to this email directly, view it on GitHub<#888 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AAIYWLMHNB7KXBOIM6SWBRD2WGC7PAVCNFSM6AAAAABZOVSK4GVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDONJRHEZDSOJUGQ>. You are receiving this because you were mentioned.Message ID: ***@***.***> [Image removed by sender. andrii-i]andrii-i left a comment (jupyterlab/jupyterlab-desktop#888)<#888 (comment)> Hi @lewisl<https://github.com/lewisl>. Thank you for creating this issue. I've tried installing jupyterlab-desktop on my mac and did not have the same problem. At the same time there is a known issue with permissions in macOS, could you please try steps suggested here https://github.com/jupyterlab/jupyterlab-desktop/blob/master/troubleshoot.md#macos-write-permission-issues? — Reply to this email directly, view it on GitHub<#888 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AAIYWLMHNB7KXBOIM6SWBRD2WGC7PAVCNFSM6AAAAABZOVSK4GVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDONJRHEZDSOJUGQ>. You are receiving this because you were mentioned.Message ID: ***@***.***>

[lewisl]

Let me add that when I click the hamburger menu with the failure to start the session this charming and helpful message appears: A JavaScript error occurred in the main process Uncaught Exception: TypeError: Cannot read properties of undefined (reading 'uiMode') at IpcMainImpl.<anonymous> (/Applications/JupyterLab.app/Contents/Resources/app.asar/build/out/main/sessionwindow/sessionwindow.js:631:47) at IpcMainImpl.emit (node:events:514:28) at WebContents.<anonymous> (node:electron/js2c/browser_init:2:88262) at WebContents.emit (node:events:514:28) From: Lewis Levin ***@***.***> Date: Tuesday, March 25, 2025 at 11:15 AM To: jupyterlab/jupyterlab-desktop ***@***.***>, jupyterlab/jupyterlab-desktop ***@***.***> Cc: Mention ***@***.***> Subject: Re: [jupyterlab/jupyterlab-desktop] Never works for me (Issue #888) So, these instructions are not going to help: 1. I am not using the bundled Python. I am not going to because there is no reason to require a private Python when I have a perfectly good Python already. I am not using Conda installed Python and will not. I am not using the system installed Python. I installed Python myself to: /Library/Frameworks/Python.framework/Versions/3.13/bin/python3. It works perfectly and runs jupyter lab and launches the Jupyterlab in my default browser. I can connect to it the running instance with Jupyterlab app. So, the app itself runs. The app cannot create a session of its own, however. So, all the advice for a bundled Python does not seem to apply. 2. Manage Python Environments seems to show the right environments. It shows 2 venv’s. I don’t manually create venv’s. I find it much too confusing and I don’t need to run different versions of Python with different packages installed, so I only have 1 venv. Jupyterlab app successfully finds it and reports it as: /Library/Frameworks/Python.framework/Versions/3.13/bin/python3. Just like above. The problem might be that jupterlab app sees it but won’t use it. The Manage Python Environment dialog reports that it IS using the default python venv. There is also a directory for “New Python envirionment install directory”: /Users/lewis/Library/jupyterlab-desktop/envs. This directory exists and is empty as it should be. 3. The permissions problem seems to relate to the cli interface to jupterlab app. In the advanced setting tab it reports: “jlab CLI command is ready to use in your system terminal”. Of course, I don’t know why this is even needed unless it’s how the Python instance of jupyter server talks to jupterlab app. Given that I can successfully have the app “talk to” and run an existing server just by pasting in its local url, probably the cli is working if it is used in the way I am guessing. 4. Last thing, I am resetting the permissions for the directory where the app is installed per the instructions even though there doesn’t appear to be any problem with the cli. After doing that, I quit the above mentioned session connecting to an existing jupyter server instance. Launch the app. Start a new session. It fails with “Error: Jupyter Server Process terminated before the initialization completed.” New notebook command fails in the same way. So, it seems that this app must have its own Python. And that I won’t do. So, it would be nice to use this as a faster way to launch and work on Notebooks (and better than the slow VS Code internal implementation of notebooks, though convenient. But, I do have 2 other ways to use Notebooks and jupyterlab. Let me know if there is anything else you’d like me try or whether you even intend the app to work with external Python (but not conda). From: Andrii Ieroshenko ***@***.***> Reply-To: jupyterlab/jupyterlab-desktop ***@***.***> Date: Tuesday, March 25, 2025 at 9:55 AM To: jupyterlab/jupyterlab-desktop ***@***.***> Cc: Lewis Levin ***@***.***>, Mention ***@***.***> Subject: Re: [jupyterlab/jupyterlab-desktop] Never works for me (Issue #888) Hi @lewisl<https://github.com/lewisl>. Thank you for creating this issue. I've tried installing jupyterlab-desktop on my mac and did not have the same problem. At the same time there is a known issue with permissions in macOS, could you please try steps suggested here https://github.com/jupyterlab/jupyterlab-desktop/blob/master/troubleshoot.md#macos-write-permission-issues? — Reply to this email directly, view it on GitHub<#888 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AAIYWLMHNB7KXBOIM6SWBRD2WGC7PAVCNFSM6AAAAABZOVSK4GVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDONJRHEZDSOJUGQ>. You are receiving this because you were mentioned.Message ID: ***@***.***> [Image removed by sender. andrii-i]andrii-i left a comment (jupyterlab/jupyterlab-desktop#888)<#888 (comment)> Hi @lewisl<https://github.com/lewisl>. Thank you for creating this issue. I've tried installing jupyterlab-desktop on my mac and did not have the same problem. At the same time there is a known issue with permissions in macOS, could you please try steps suggested here https://github.com/jupyterlab/jupyterlab-desktop/blob/master/troubleshoot.md#macos-write-permission-issues? — Reply to this email directly, view it on GitHub<#888 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AAIYWLMHNB7KXBOIM6SWBRD2WGC7PAVCNFSM6AAAAABZOVSK4GVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDONJRHEZDSOJUGQ>. You are receiving this because you were mentioned.Message ID: ***@***.***>

[danyeaw]

Hi @lewisl, thanks for the additional information. I understand from your set up that you would prefer not to use conda or a Python virtualenv. Could we please get some steps for how you could reproduce this with a fresh install of Python from python.org?

We would expect that JupyterLab-Desktop works without using conda or virtualenvs.

[lewisl]

Sorry to not be more detailed but basically: 1. Download the appropriate Python .dmg from Python.org 2. Install it. 3. Use pip to pip install jupyter. Now you get everything for lab, nbconvert, etc. with only one pip command. 4. Go to Julia, set the ENV[“JUPYTER”] to the location of the jupyter binary. 5. Do ```using IJulia``` to force creation of a suitable Julia kernel. 6. Go to command line and run ```jupyter lab``` to make sure everything works. It does. Now go install jupyter.app. Try to run it. Check to make sure it discovers the “custom” environment. It appears to at the above address to the jupyter binary. I didn’t have to do that manually or fix it. Then jupytperlab fails as described. From: Dan Yeaw ***@***.***> Reply-To: jupyterlab/jupyterlab-desktop ***@***.***> Date: Tuesday, April 1, 2025 at 9:53 AM To: jupyterlab/jupyterlab-desktop ***@***.***> Cc: Lewis Levin ***@***.***>, Mention ***@***.***> Subject: Re: [jupyterlab/jupyterlab-desktop] [macOS] App CLI is not executable Error: EACCES: permission denied (Issue #888) Hi @lewisl<https://github.com/lewisl>, thanks for the additional information. I understand from your set up that you would prefer not to use conda or a Python virtualenv. Could we please get some steps for how you could reproduce this with a fresh install of Python from python.org? We would expect that JupyterLab-Desktop works without using conda or virtualenvs. — Reply to this email directly, view it on GitHub<#888 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AAIYWLJU5PFUPUMX55FDTIL2XLAB5AVCNFSM6AAAAABZOVSK4GVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDONRZHE4DKNJXGQ>. You are receiving this because you were mentioned.Message ID: ***@***.***> [Image removed by sender. danyeaw]danyeaw left a comment (jupyterlab/jupyterlab-desktop#888)<#888 (comment)> Hi @lewisl<https://github.com/lewisl>, thanks for the additional information. I understand from your set up that you would prefer not to use conda or a Python virtualenv. Could we please get some steps for how you could reproduce this with a fresh install of Python from python.org? We would expect that JupyterLab-Desktop works without using conda or virtualenvs. — Reply to this email directly, view it on GitHub<#888 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AAIYWLJU5PFUPUMX55FDTIL2XLAB5AVCNFSM6AAAAABZOVSK4GVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDONRZHE4DKNJXGQ>. You are receiving this because you were mentioned.Message ID: ***@***.***>

[lewisl]

Everything I described above involved using a fresh install from Python.org. Use the dmg installer to install python. Use pip3 to install Jupyter. Then download the dmg installer for jupyterlab desktop. Install it. Run it and click on "new notebook" (not sure that's right--I am not looking at it now). The "environment" cannot be created. Perhaps the permissions problem happens because the app wants to create a venv. Shouldn't need to. Just use the default environment. I'll note again that running Jupyter in a browser has no such problem: just run jupyter lab in terminal and presto, a tab starts with Jupyter lab running. Probably why there is not too much reason to get worked up about this. But, someone should probably diagnose this at some point because it may point to other problems, though the list of bugs and unresolved issues seems long indeed. If this were really something new and self-contained like notebooks in VS Code or a generalized R Studio (for more than R), then you'd really have something. As it is (and you guys make no other claim--so no issue) it's just Jupyter lab in electron/blink, which is just a browser with a bunch of extraneous browser UI surrounding Jupyter lab. Some slight advantage in that but not much.