Flatpak runtime org.freedesktop.Platform not found

[LorenAmelang]

Description

I have a new System76 Meerkat with Pop-OS 24.04 and the Cosmic Desktop. I want to migrate my TriliumNext there, by synching to my trilium.cc server.

I've found that Flatpak installations have the best chance of working properly in dark mode under Cosmic. (Especially Sublime Text and Libre Office.) The Cosmic Store and the Flathub Github only know about an ancient 2+ year old Trilium version.

So I downloaded the latest Flatpak from the Trilium Github:
https://github.com/TriliumNext/Trilium/releases/tag/v0.102.2 (260405)

When I try to install:

All packages are up to date.
loren@pop-os:~$ date
Fri Apr 10 08:03:43 PM PDT 2026

loren@pop-os:~/Downloads/Installers/Trilium$ flatpak install ~/Downloads/Installers/Trilium/TriliumNotes-v0.102.2-linux-x64.flatpak
error: The application com.triliumnext.notes/x86_64/stable requires the runtime org.freedesktop.Platform/x86_64/24.08 which was not found

loren@pop-os:~/Downloads/Installers/Trilium$ flatpak install flathub org.freedesktop.Platform
Looking for matches…
Similar refs found for ‘org.freedesktop.Platform’ in remote ‘flathub’ (user):

1. runtime/org.freedesktop.Platform/x86_64/19.08
2. runtime/org.freedesktop.Platform/x86_64/25.08
3. runtime/org.freedesktop.Platform/x86_64/1.6
4. runtime/org.freedesktop.Platform/x86_64/20.08
5. runtime/org.freedesktop.Platform/x86_64/21.08
6. runtime/org.freedesktop.Platform/x86_64/22.08
7. runtime/org.freedesktop.Platform/x86_64/23.08
8. runtime/org.freedesktop.Platform/x86_64/18.08
9. runtime/org.freedesktop.Platform/x86_64/24.08

Which do you want to use (0 to abort)? [0-9]: 9
Skipping: org.freedesktop.Platform/x86_64/24.08 is already installed
loren@pop-os:~/Downloads/Installers/Trilium$

(25.08 is also reportedly installed.)

I tried a recommendation from the web:

loren@pop-os:~/Downloads/Installers/Trilium$ flatpak install --user runtime/org.freedesktop.Platform/x86_64/24.08
Looking for matches…
Skipping: org.freedesktop.Platform/x86_64/24.08 is already installed

I don't know what else to try! I assume the official Flatpak from the Trilium Github should just work. I suspect there is a Flatpak or Cosmic problem here, but they don't seem to know about recemt Trilium versions, so I'm trying here first.

Does anyone understand this?

I tried to search for the file:

loren@pop-os:~/.local/share/flatpak/runtime/org.freedesktop.Platform/x86_64/24.08$ ls -al
total 16
drwxrwxr-x 3 loren loren 4096 Apr 7 14:20 .
drwxrwxr-x 4 loren loren 4096 Apr 10 19:51 ..
drwxr-xr-x 3 loren loren 4096 Apr 7 14:20 8e2d609ad6f18f5e9eb119c6eddf5572e7d51fd54cf08baaaf24de823c58b0bf
lrwxrwxrwx 1 loren loren 64 Apr 7 14:20 active -> 8e2d609ad6f18f5e9eb119c6eddf5572e7d51fd54cf08baaaf24de823c58b0bf

loren@pop-os:~/.local/share/flatpak/runtime/org.freedesktop.Platform/x86_64/24.08/8e2d609ad6f18f5e9eb119c6eddf5572e7d51fd54cf08baaaf24de823c58b0bf$ ls files/share
alsa defaults gettext-0.22.5 hwdata libthai mythes spa-0.2 wayland
app-info doc glib-2.0 hyphen licenses nano ss X11
appstream ffmpeg gnupg i18n locale openal tabset xkeyboard-config-2
awk fonts gst-plugins-base ibus man p11-kit terminfo xml
bash-completion gcc-14.3.0 gstreamer-1.0 icons metainfo pipewire themes zenity
common-lisp GConf gtk-3.0 icu mime pki thumbnailers zoneinfo
cracklib gdb gtk-doc info misc runtime vala
dbus-1 gettext hunspell iso-codes myspell slsh vulkan

So "runtime" is there. But digging further seems to go as deep as I can cope with. No idea what I'm specifically looking for...

About 50 local file hits found for -iname org.freedesktop.Platform*
Including:
/home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform.GL.default/x86_64/24.08/4c37b3e42ec09de553a93fe22fa3079ef784beda91aea794563284a25f3f77e2/files/share/app-info/xmls/org.freedesktop.Platform.GL32.default.xml.gz
And:
/home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform.GL.default/x86_64/24.08/4c37b3e42ec09de553a93fe22fa3079ef784beda91aea794563284a25f3f77e2/files/share/metainfo/org.freedesktop.Platform.GL32.default.metainfo.xml

Sorry for the text formatting. When I insert a Code block, the rest of my post disappears???

Details

loren@pop-os:~/Downloads/Installers/Trilium$ sudo find / -iname org.freedesktop.Platform* ... /home/loren/.local/share/flatpak/repo/refs/heads/deploy/runtime/org.freedesktop.Platform.GL.default /home/loren/.local/share/flatpak/repo/refs/heads/deploy/runtime/org.freedesktop.Platform.Locale /home/loren/.local/share/flatpak/repo/refs/heads/deploy/runtime/org.freedesktop.Platform.codecs-extra /home/loren/.local/share/flatpak/repo/refs/heads/deploy/runtime/org.freedesktop.Platform.VAAPI.Intel /home/loren/.local/share/flatpak/repo/refs/heads/deploy/runtime/org.freedesktop.Platform.openh264 /home/loren/.local/share/flatpak/repo/refs/heads/deploy/runtime/org.freedesktop.Platform /home/loren/.local/share/flatpak/repo/refs/remotes/flathub/runtime/org.freedesktop.Platform.GL.default /home/loren/.local/share/flatpak/repo/refs/remotes/flathub/runtime/org.freedesktop.Platform.Locale /home/loren/.local/share/flatpak/repo/refs/remotes/flathub/runtime/org.freedesktop.Platform.codecs-extra /home/loren/.local/share/flatpak/repo/refs/remotes/flathub/runtime/org.freedesktop.Platform.VAAPI.Intel /home/loren/.local/share/flatpak/repo/refs/remotes/flathub/runtime/org.freedesktop.Platform.openh264 /home/loren/.local/share/flatpak/repo/refs/remotes/flathub/runtime/org.freedesktop.Platform /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform.GL.default /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform.GL.default/x86_64/24.08/4c37b3e42ec09de553a93fe22fa3079ef784beda91aea794563284a25f3f77e2/files/share/metainfo/org.freedesktop.Platform.GL32.default.metainfo.xml /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform.GL.default/x86_64/24.08/4c37b3e42ec09de553a93fe22fa3079ef784beda91aea794563284a25f3f77e2/files/share/metainfo/org.freedesktop.Platform.GL.default.metainfo.xml /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform.GL.default/x86_64/24.08/4c37b3e42ec09de553a93fe22fa3079ef784beda91aea794563284a25f3f77e2/files/share/app-info/xmls/org.freedesktop.Platform.GL.default.xml.gz /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform.GL.default/x86_64/24.08/4c37b3e42ec09de553a93fe22fa3079ef784beda91aea794563284a25f3f77e2/files/share/app-info/xmls/org.freedesktop.Platform.GL32.default.xml.gz /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform.GL.default/x86_64/25.08-extra/d6c03d2ba3e694639789f5eed1c66d2f7a1d782b268231e64eb0bb52b40b903d/files/share/metainfo/org.freedesktop.Platform.GL32.default.metainfo.xml /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform.GL.default/x86_64/25.08-extra/d6c03d2ba3e694639789f5eed1c66d2f7a1d782b268231e64eb0bb52b40b903d/files/share/metainfo/org.freedesktop.Platform.GL.default.metainfo.xml /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform.GL.default/x86_64/25.08-extra/d6c03d2ba3e694639789f5eed1c66d2f7a1d782b268231e64eb0bb52b40b903d/files/share/app-info/xmls/org.freedesktop.Platform.GL.default.xml.gz /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform.GL.default/x86_64/25.08-extra/d6c03d2ba3e694639789f5eed1c66d2f7a1d782b268231e64eb0bb52b40b903d/files/share/app-info/xmls/org.freedesktop.Platform.GL32.default.xml.gz /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform.GL.default/x86_64/25.08/00248c58a6cd075cdd2de755d4aeac116eef7c008e7c06ca7a70196bec5a85c4/files/share/metainfo/org.freedesktop.Platform.GL32.default.metainfo.xml /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform.GL.default/x86_64/25.08/00248c58a6cd075cdd2de755d4aeac116eef7c008e7c06ca7a70196bec5a85c4/files/share/metainfo/org.freedesktop.Platform.GL.default.metainfo.xml /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform.GL.default/x86_64/25.08/00248c58a6cd075cdd2de755d4aeac116eef7c008e7c06ca7a70196bec5a85c4/files/share/app-info/xmls/org.freedesktop.Platform.GL.default.xml.gz /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform.GL.default/x86_64/25.08/00248c58a6cd075cdd2de755d4aeac116eef7c008e7c06ca7a70196bec5a85c4/files/share/app-info/xmls/org.freedesktop.Platform.GL32.default.xml.gz /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform.GL.default/x86_64/24.08extra/b673a02e887ff6f35f5526973498170abd9748147d2be01cc42e8c2a8eba5899/files/share/metainfo/org.freedesktop.Platform.GL32.default.metainfo.xml /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform.GL.default/x86_64/24.08extra/b673a02e887ff6f35f5526973498170abd9748147d2be01cc42e8c2a8eba5899/files/share/metainfo/org.freedesktop.Platform.GL.default.metainfo.xml /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform.GL.default/x86_64/24.08extra/b673a02e887ff6f35f5526973498170abd9748147d2be01cc42e8c2a8eba5899/files/share/app-info/xmls/org.freedesktop.Platform.GL.default.xml.gz /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform.GL.default/x86_64/24.08extra/b673a02e887ff6f35f5526973498170abd9748147d2be01cc42e8c2a8eba5899/files/share/app-info/xmls/org.freedesktop.Platform.GL32.default.xml.gz /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform.Locale /home/loren/.local/share/flatpak/runtime/org.kde.Platform/x86_64/6.10/49bc183da466bec44bab4f6f641cab401584d1ee30872b428f46c3b8066527d3/files/share/metainfo/org.freedesktop.Platform.metainfo.xml /home/loren/.local/share/flatpak/runtime/org.kde.Platform/x86_64/6.10/49bc183da466bec44bab4f6f641cab401584d1ee30872b428f46c3b8066527d3/files/share/app-info/xmls/org.freedesktop.Platform.xml.gz /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform.codecs-extra /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform.codecs-extra/x86_64/25.08-extra/c0512f067028842bf31d76ca2952f315cd6ff9c11c2a3419d3b441110dcc6d95/files/share/metainfo/org.freedesktop.Platform.codecs-extra.metainfo.xml /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform.codecs-extra/x86_64/25.08-extra/c0512f067028842bf31d76ca2952f315cd6ff9c11c2a3419d3b441110dcc6d95/files/share/app-info/xmls/org.freedesktop.Platform.codecs-extra.xml.gz /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform.VAAPI.Intel /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform.VAAPI.Intel/x86_64/24.08/46ffacb89830c94c9b1aec9fa0c71c45b2cb2190f15edc07864992502752809e/files/share/metainfo/org.freedesktop.Platform.VAAPI.Intel.metainfo.xml /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform.VAAPI.Intel/x86_64/24.08/46ffacb89830c94c9b1aec9fa0c71c45b2cb2190f15edc07864992502752809e/files/share/app-info/xmls/org.freedesktop.Platform.VAAPI.Intel.xml.gz /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform.VAAPI.Intel/x86_64/25.08/a3865a2be8d06a3c2c40b741bf0cda7605bcc757c35baf747f01cc8cb48068fa/files/share/metainfo/org.freedesktop.Platform.VAAPI.Intel.metainfo.xml /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform.VAAPI.Intel/x86_64/25.08/a3865a2be8d06a3c2c40b741bf0cda7605bcc757c35baf747f01cc8cb48068fa/files/share/app-info/xmls/org.freedesktop.Platform.VAAPI.Intel.xml.gz /home/loren/.local/share/flatpak/runtime/org.freedesktop.Sdk/x86_64/25.08/37c47d7f28c28226e100f12b23e5bfce0a8a0a22f6d6dc720f202ab31bf49e05/files/share/metainfo/org.freedesktop.Platform.metainfo.xml /home/loren/.local/share/flatpak/runtime/org.freedesktop.Sdk/x86_64/25.08/37c47d7f28c28226e100f12b23e5bfce0a8a0a22f6d6dc720f202ab31bf49e05/files/share/app-info/xmls/org.freedesktop.Platform.xml.gz /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform.openh264 /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform.openh264/x86_64/2.5.1/0f52621e4540863ee86b1fe26216fff78fefa1096f367079692344139228e474/files/share/metainfo/org.freedesktop.Platform.openh264.metainfo.xml /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform.openh264/x86_64/2.5.1/0f52621e4540863ee86b1fe26216fff78fefa1096f367079692344139228e474/files/share/app-info/xmls/org.freedesktop.Platform.openh264.xml.gz /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform/x86_64/24.08/8e2d609ad6f18f5e9eb119c6eddf5572e7d51fd54cf08baaaf24de823c58b0bf/files/share/metainfo/org.freedesktop.Platform.metainfo.xml /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform/x86_64/24.08/8e2d609ad6f18f5e9eb119c6eddf5572e7d51fd54cf08baaaf24de823c58b0bf/files/share/app-info/xmls/org.freedesktop.Platform.xml.gz /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform/x86_64/25.08/18c4d2cd492ef63f2ba38cd06de0149d2542404144a0e0f6ebe0dfe5f7dbb680/files/share/metainfo/org.freedesktop.Platform.metainfo.xml /home/loren/.local/share/flatpak/runtime/org.freedesktop.Platform/x86_64/25.08/18c4d2cd492ef63f2ba38cd06de0149d2542404144a0e0f6ebe0dfe5f7dbb680/files/share/app-info/xmls/org.freedesktop.Platform.xml.gz loren@pop-os:~/Downloads/Installers/Trilium$ /

TriliumNext Version

0.102.2

What operating system are you using?

Other Linux

What is your setup?

Local + server sync

Operating System Version

System76 Pop-OS 24.04 and the Cosmic Desktop

Error logs

(See above description. Is there some log I should look for?)

[dosubot[bot]]

This looks like a user vs. system Flatpak installation scope mismatch. Your runtime is installed in the user scope (files live under ~/.local/share/flatpak/), but when you run flatpak install on the downloaded .flatpak bundle without specifying --user, it defaults to installing the app in the system scope — where it can't see your user-scoped runtime.

Try installing the Flatpak with the --user flag so the app and runtime are in the same scope:

flatpak install --user ~/Downloads/Installers/Trilium/TriliumNotes-v0.102.2-linux-x64.flatpak

If that doesn't work, you can try the reverse — install the runtime system-wide and then install the app system-wide:

sudo flatpak install flathub org.freedesktop.Platform//24.08
sudo flatpak install ~/Downloads/Installers/Trilium/TriliumNotes-v0.102.2-linux-x64.flatpak

The key is that both the runtime and the application must be in the same scope (both --user or both system-wide). Your find output confirms the runtime only exists under ~/.local/share/flatpak/ (user scope), so flatpak install --user for the app should resolve it.

For reference, the TriliumNext Flatpak is configured to require org.freedesktop.Platform version 24.08 via the org.electronjs.Electron2.BaseApp [1].

To reply, just mention @dosu.

---

Docs are dead. Just use Dosu.

[LorenAmelang]

Adding --user seemed to work. Trilium is in my apps list, and I can get the install screen.

But it draws the action buttons off the bottom of my screen. And the cursor action happens about 1.5 inches above the visible arrow icon! Or if I set scaling way below 100%, the buttons are off the bottom of its window. I finally got a click past the useless resize icon which won't move the boundaries, and now it is stuck on:
{"message":"Router not found for request GET //api/setup/sync-seed"}

If I try that in my browser I get the same error.
https://psychoros.trilium.cc//api/setup/sync-seed
But
https://psychoros.trilium.cc/#root?ntxId=xxxxxx
shows me my notes.

I tried your "If that doesn't work" suggestion:

loren@pop-os:$ date
Sun Apr 12 04:02:32 PM PDT 2026
loren@pop-os:$ sudo flatpak install flathub org.freedesktop.Platform//24.08
[sudo] password for loren:
Looking for matches…
error: No remote refs found for ‘flathub’
loren@pop-os:~$

Why does the installed Trilium fail to connect to trilium.cc?

[dosubot[bot]]

Good news — both of these issues are identifiable.

The sync error "Router not found for request GET //api/setup/sync-seed" — notice the double slash (//api/...). This happens when you enter your server URL with a trailing slash (e.g., https://psychoros.trilium.cc/). Trilium concatenates /api/setup/sync-seed onto it, producing //api/... which the server doesn't recognize. When you set up the sync connection, make sure your server URL does not end with a trailing slash — use https://psychoros.trilium.cc instead of https://psychoros.trilium.cc/. This is the same class of bug as a documented issue in the web clipper where trailing slashes break API requests [1].

The buttons being off-screen / UI overflow — this is a confirmed bug tracked in #6781 (with duplicates at #7998 and #8493) [2]. A rewrite of the onboarding interface is planned. In the meantime, you can use the Tab key to cycle focus to the hidden buttons and press Enter to activate them [3].

The cursor offset (click registering ~1.5 inches above the visible cursor) sounds like a Wayland/Cosmic scaling issue with the Electron app — not specific to Trilium itself. You might try launching with --ozone-platform-hint=auto or setting the ELECTRON_OZONE_PLATFORM_HINT=auto environment variable, which can help Electron apps behave better under Wayland compositors.

To reply, just mention @dosu.

---

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[LorenAmelang]

OMG! Thank you so much! I wondered about that trailing /, but it has been in my notes for ages. Guess I haven't set up a new instance for ages... And Tab worked to get the button pressed.

Yes, Cosmic and Wayland seem complicated! But I haven't seen the cursor action displaced from the icon anywhere except that sync setup screen. I'll be watching...

Now I just wait for 66000 notes to cross the Atlantic and the US.

@dosu might be improving my opinion of bots! But when I clicked the "just mention @dosu" link I didn't get a reply field - I got a gaudy irrelevant promo page.

[dosubot[bot]]

Glad that worked out! 🎉 That trailing slash is a sneaky one — easy to overlook when it's been in your notes forever.

66,000 notes is quite the collection — hope the sync goes smoothly across the pond!

And sorry about the link experience — that's not the intended behavior. You can always just type @dosu in a comment to get my attention, no special link needed. Happy to help if anything else comes up with the setup or the sync.

To reply, just mention @dosu.

---

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