Actually is possible open app LosslessCut only with this command:
env -u WAYLAND_DISPLAY -u XDG_SESSION_TYPE losslesscut
Is snapd also responsible for this bug too?
Is it reasonable to create a bug report for snapd?
ubuntu-bug snapd
snapd does not build the snaps, the tool to do that is called snapcraft. If you believe snapcraft should do a better job you can file a bug here: https://github.com/canonical/snapcraft/issues. Snapd cannot also guess what to do to make a snap work, same way deb or rpm cannot fix a broken package. Itâs ultimately a job of whoever published the snap to ensure it works.
The âfixâ you listed here though indicates itâs a usual set of issues with electron. However, TBH whoever packaged losssless-cut as a snap could be applying themselves. Electon is known to require various quirks. The contact point for losslesscut is: https://mifi.no/losslesscut/
If you contact the developers, please highlight that their snap is using core20 base. Since itâs a desktop application, it is generally recommended to update to a newer build base so that they can benefit from the latest gnome and mesa runtimes.
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mborzecki1
Thank you very much for your good advice.
I will forward the information to the developer.
My opinion is that one of the reasons for the bug is that I am using Wayland in Kubuntu. I am running the latest version of Kubuntu.
Not all applications are compatible with Wayland. In the previous version of Kubuntu, it was possible to choose on the login screen whether you wanted the Wayland or X.Org (X11) window manager.
In the latest version of Kubuntu, the Canonical developers decided to remove X.Org (X11).
I spent three hours trying to install X.Org (X11) but was unsuccessful. The guides I found online did not work for me.
Note thereâs a thing called XWayland which is supported by most window managers and should work seamlessly even if your desktop is not a X11 session.
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Thank you very much for your message.
This is new information for me, which has been enlightening and helped me understand how Kubuntu works.
I wasnât aware that XWayland existed. I checked, and I had XWayland successfully installed on my computer.
In Ubuntu ( 24.04.4 LTS) I uninstalled ( sudo snap remove losslesscut ) and re-installed ( sudo snap install losslesscut ) LossLessCut snap, after it stopped working. With no success.
My solution in March 2026 was finally to download x64 AppImage from: GitHub - mifi/lossless-cut: The swiss army knife of lossless video/audio editing ¡ GitHub and make it executable . That worked. See also Linux-troubleshooting-info: lossless-cut/docs/troubleshooting.md at master ¡ mifi/lossless-cut ¡ GitHub ( that ./lossless-cut --no-sandbox , -tip did not work for me, only AppImage this time solved the problem.
BTW, it seems to have something to do with the windowing system, X11 is not fully âvanishedâ.