Suddenly all AppImages stopped working, how to troubleshoot

[adlingepa]

I was using multiple applications as AppImage bnaries. But since last few days all Applmages stopped working.
When I double click the AppImage file, file explorer becomes non-responsive for some time, after 2-3 minutes it start responding but AppImage wont launched.
Using Ubuntu Linux 18.04 LTS

[azubieta]

Are you using AppImageLauncher or some other "integration" tool ?

Could you try launching the AppImage from the CLI and share the logs ?

[probonopd]

Closing due to no answer.

[typoworx-de]

I'm having similar problem and I think the problem is some new restrictions on Ubuntu 24 (and maybe other distros as well?!)

Shorthand solution:
add --no-sandboxafter the App-Image as argument bypassing Sandboxing.

Possible long-term solution:
(example with one of my AppImages)

./restic-backup-gx-0.17.0.AppImage --appimage-extract

sudo chown root:root squashfs-root/chrome-sandbox
sudo chmod 4755 squashfs-root/chrome-sandbox

./squashfs-root/AppRun

This works. Of course this is not what AppImage is thinked for. Is it possible to fix these permissions on chrome-sandbox on packing? maybe it's useful to check for chrome-sandbox in AppImageKit and fix that permissions on creation?

[probonopd]

Please see

https://docs.appimage.org/user-guide/troubleshooting/electron-sandboxing.html

[typoworx-de]

Thanks for the hint @probonopd. I already noticed this solution somewhere else - but in other places it was told like kind of insecure in some concerns.