*** This bug is a duplicate of bug 1933996 *** https://bugs.launchpad.net/bugs/1933996
I believe that the bug is related to Wayland. It can be fixed by not using it as described here: https://askubuntu.com/questions/1349544/alttab-stops-working-after-a- while-in-ubuntu-21-04/1359821#1359821 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1934527 Title: Window switching with Alt-Tab stops working after a while Status in gnome-shell package in Ubuntu: Confirmed Bug description: On Ubuntu 21.04,since around 01 July 2021, Alt-Tab works as usual for a while after logging in, but then stops entirely (that is, it does nothing; the switcher overlay fails to appear, and switching between windows does not work). I made _no_ configuration change, and Alt-Tab continues to be configured in the keyboard shortcuts settings as usual. This has been described by other users here: https://askubuntu.com/questions/1349544/alttab-stops-working-after-a- while-in-ubuntu-21-04 There seems to be some possible connection to Thunderbird in particular, and the fact that in the left-hand-side launcher (?) / favourites of the Ubuntu desktop, the Thunderbird icon starts behaving strangely, e.g. does not show the open Thunderbird windows when clicking on it ... while other applications work. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1934527/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp