It sounds like you might have two different bugs, if the purple screen is bug 1766137.
Please: 1. Run this command to attach more information: apport-collect 1771661 2. Run 'lspci -k' and attach its output here. 3. Copy /proc/cmdline and attach it here. ** Tags added: bionic nvidia ** Changed in: gdm3 (Ubuntu) Status: New => Incomplete ** Also affects: nvidia-graphics-drivers-390 (Ubuntu) Importance: Undecided Status: New ** Changed in: nvidia-graphics-drivers-390 (Ubuntu) Status: New => Incomplete ** Summary changed: - After updating to 18.04 only Wayland works. Cannot get Xorg to work on Gnome + [nvidia] After updating to 18.04 only Wayland works. Cannot get Xorg to work on Gnome -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1771661 Title: [nvidia] After updating to 18.04 only Wayland works. Cannot get Xorg to work on Gnome To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1771661/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs