I'm using a 18.04 upgraded from 17.10 and I have the same issue but slightly different. The difference is that if I lock the screen for more than a certain amount of time, when I wake it up, I find myself logged out. And to get away the blanked screen, I used Alt+F2 and then Alt+F1, and the gdm says "Authentication failed", which is quite similar to #19. And I'm using gnome-session with Wayland.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1766137 Title: [regression] Password accepted but login fails (blank purple screen and mouse pointer only) To manage notifications about this bug go to: https://bugs.launchpad.net/gdm/+bug/1766137/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs