I switched display managers from lightdm to gdm and it fixed the issue sudo systemctl status display-manager
sudo dpkg-reconfigure lightdm systemctl status gdm.service sudo apt install --reinstall ubuntu-session reboot machine Info about the issue: https://bbs.archlinux.org/viewtopic.php?id=150017 https://askubuntu.com/questions/1245071/cant-lock-screen-with-shortcut- on-ubuntu-20-04-gnome -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-control-center in Ubuntu. https://bugs.launchpad.net/bugs/1898153 Title: I upgraded from 18.04 to 20.04.1 and the screen doesn't lock or go blank at the set time. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1898153/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
