Ok I fixed, reading the journalctl I found the issue, the problem was that I deleted the original system user and for some reason the user was still as autologin in the gdm3 configuration Can be closed
** Changed in: gdm3 (Ubuntu) Status: Incomplete => Invalid -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gdm3 in Ubuntu. https://bugs.launchpad.net/bugs/1970073 Title: GDM3 is failing to switch users, it also crashes when you log out To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1970073/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs