2.2 : The graphical interface does not load its SVG images

[Raizo62]

Hi

With GNS3 2.2, GNS3 doesn't load its SVG images :

With the debug mode, we see :

2025-12-26 09:47:43 DEBUG http_client:716 Decoding response from http://user@localhost:3080/v2/symbols/%3A/symbols/ethernet_switch.svg/raw response 200
2025-12-26 09:47:43 DEBUG controller:309 File stored /tmp/tmp8jxo85n9-gns3/855e8cf4fe8848800855d1b9730328d1.svg for /symbols/%3A/symbols/ethernet_switch.svg/raw
2025-12-26 09:47:43 DEBUG controller:361 Invalid symbol /tmp/tmp8jxo85n9-gns3/855e8cf4fe8848800855d1b9730328d1.svg
2025-12-26 09:47:43 DEBUG http_client:716 Decoding response from http://user@localhost:3080/v2/symbols/%3A/symbols/hub.svg/raw response 200
2025-12-26 09:47:43 DEBUG controller:309 File stored /tmp/tmp8jxo85n9-gns3/8ebdb8f0fe6895a42d27ed50b06de689.svg for /symbols/%3A/symbols/hub.svg/raw
2025-12-26 09:47:43 DEBUG controller:361 Invalid symbol /tmp/tmp8jxo85n9-gns3/8ebdb8f0fe6895a42d27ed50b06de689.svg
2025-12-26 09:47:43 DEBUG http_client:716 Decoding response from http://user@localhost:3080/v2/symbols/%3A/symbols/cloud.svg/raw response 200
2025-12-26 09:47:43 DEBUG controller:309 File stored /tmp/tmp8jxo85n9-gns3/b7fc40772980613897e485197a957f88.svg for /symbols/%3A/symbols/cloud.svg/raw
2025-12-26 09:47:43 DEBUG controller:361 Invalid symbol /tmp/tmp8jxo85n9-gns3/b7fc40772980613897e485197a957f88.svg
2025-12-26 09:47:43 DEBUG http_client:716 Decoding response from http://user@localhost:3080/v2/symbols/%3A/symbols/frame_relay_switch.svg/raw response 200
2025-12-26 09:47:43 DEBUG controller:309 File stored /tmp/tmp8jxo85n9-gns3/2a45f9c65479fc28388a2332e7b3c526.svg for /symbols/%3A/symbols/frame_relay_switch.svg/raw
2025-12-26 09:47:43 DEBUG controller:361 Invalid symbol /tmp/tmp8jxo85n9-gns3/2a45f9c65479fc28388a2332e7b3c526.svg
2025-12-26 09:47:43 DEBUG http_client:716 Decoding response from http://user@localhost:3080/v2/symbols/%3A/symbols/nat.svg/raw response 200
2025-12-26 09:47:43 DEBUG controller:309 File stored /tmp/tmp8jxo85n9-gns3/6dfea2102a16026718e99a8522be4965.svg for /symbols/%3A/symbols/nat.svg/raw
2025-12-26 09:47:43 DEBUG controller:361 Invalid symbol /tmp/tmp8jxo85n9-gns3/6dfea2102a16026718e99a8522be4965.svg
2025-12-26 09:47:43 DEBUG http_client:716 Decoding response from http://user@localhost:3080/v2/symbols/%3A/symbols/atm_switch.svg/raw response 200
2025-12-26 09:47:43 DEBUG controller:309 File stored /tmp/tmp8jxo85n9-gns3/d8198a5d11a729a46b8074c9af9549c1.svg for /symbols/%3A/symbols/atm_switch.svg/raw
2025-12-26 09:47:43 DEBUG controller:361 Invalid symbol /tmp/tmp8jxo85n9-gns3/d8198a5d11a729a46b8074c9af9549c1.svg

[grossmj]

Is this from the repository? I just switched to PyQt6, which may explain why...

[Raizo62]

Is this from the repository?

Yes...always ;-)

I just switched to PyQt6, which may explain why...

Yes....I supposed.
I haven't retested since (it might be a bug in Qt6), or I might be missing an additional package.

[Raizo62]

Version 2.2.56
GUI

Fixing tab name in MobaXterm
PyQt6 migration
Add XDG Config Home support

Server

Set default location of udhcpc in "/etc/network/udhcpc". Fixes https://github.com/GNS3/gns3-gui/issues/2582
Upgrade pywin32 to v311

@grossmj : Do you think the problem is on my end ? I recompiled today, but it hasn't changed (bug in Debian trixie ?).

[grossmj]

Not sure what the problem is, I will download Debian Trixie to see.

How do you install GNS3 on it? (in a virtual env?)

[Raizo62]

How do you install GNS3 on it? (in a virtual env?)

not in virtual env.

[Raizo62]

I build a version and i send you an iso

[grossmj]

I tested on a freshly installed Debian Trixie VM and I haven't see any problem. Here is what I did:

python3 -m venv python-venv
source pyhton-venv/bin/activate
python3 -m pip install PyQt6
python3 -m pip install gns3-gui==2.2.56
python3 -m pip install gns3-server==2.2.56

I suspect an install / conflict problem in your ISO, looks like the SVG module is not loaded because when I try the following Python code I don't see SVG in the supported image formats:

from PyQt6 import QtGui
 formats = QtGui.QImageReader().supportedImageFormats()
", ".join(sorted([fmt.data().decode('utf-8').upper() for fmt in formats]))

My system shows 'BMP, CUR, GIF, ICNS, ICO, JFIF, JPEG, JPG, PBM, PDF, PGM, PNG, PPM, SVG, SVGZ, TGA, TIF, TIFF, WBMP, WEBP, XBM, XPM'

[Raizo62]

I have tested with this python code :

from PyQt6.QtGui import QImageReader

print(", ".join(
    sorted(fmt.data().decode().upper()
           for fmt in QImageReader.supportedImageFormats())
))

Debian package "libqt6svg6" was installed, but I had to install Debian package "qt6-svg-plugins" for it to work.

[grossmj]

Good finding about qt6-svg-plugins 👍 so is it working?

[Raizo62]

so is it working?

yes :-)