I have a kinda similar problem on xubuntu 18.04. And had that problem on xubuntu 16.04.
After I type the password, there is only desktop wallpaper and mouse pointer (it moves). Then I press Ctr-Alt-Del and go back to password screen again (screen resolution changes to low), then I enter password and suddenly all works, everything is upsie-daisy. I believe it somehow connected to nvidia drivers. Under nvidia-384 it problem doesn't existed, but on nvidia-390 and 396 it does. -- 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/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 -- desktop-bugs mailing list email@example.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs