1. Start with one extension and remove it from Gnome Tweak Tools or the GNOME Shell Extensions web site: https://extensions.gnome.org/local/
2. Restart GNOME Shell with ALT+F2, type in r then hit enter
3. If don't experience this bug for a few hours or days (days would be preferred) let us know in this bug report and which extension you completely removed. Perhaps we can narrow down on the problematic extension this way, if it is actually an extension.
4. If you still hit this bug a few minutes or hours later, logout from your session completely and try use the desktop for a few days. If you still have this problem try the next extension and repeat 1-3.
If you have no more extensions installed and the error occurs, please consider filing a new bug report as soon as possible with ubuntu-bug gnome-shell and link the new bug report as a comment in this bug report.
To expand on what Daniel said:
1. Start with one extension and remove it from Gnome Tweak Tools or the GNOME Shell Extensions web site: https:/ /extensions. gnome.org/ local/
2. Restart GNOME Shell with ALT+F2, type in r then hit enter
3. If don't experience this bug for a few hours or days (days would be preferred) let us know in this bug report and which extension you completely removed. Perhaps we can narrow down on the problematic extension this way, if it is actually an extension.
4. If you still hit this bug a few minutes or hours later, logout from your session completely and try use the desktop for a few days. If you still have this problem try the next extension and repeat 1-3.
If you have no more extensions installed and the error occurs, please consider filing a new bug report as soon as possible with ubuntu-bug gnome-shell and link the new bug report as a comment in this bug report.
I hope the steps above are useful.
Thanks