I have the same symptoms on 3 different computers (all upgraded from Ubuntu 20.04).
I do have the error message "Removing a network device that was not added" in /var/log/syslog, but not at the time when the problem occurs. My computers are always plugged to the network with an ethernet cable. I only have one gnome extension (on the 3 of them): https://github.com/paradoxxxzero/gnome-shell-system-monitor-applet I found the workaround to hit ctrl-alt-F1 then ctrl-alt-F2: after typing my password again, my session is back -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1975884 Title: Temporary screen freeze when gnome-shell logs "Removing a network device that was not added" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1975884/+subscriptions -- desktop-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
