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 Desktop Packages, which is subscribed to gdm3 in Ubuntu. https://bugs.launchpad.net/bugs/1771661 Title: [nvidia] After updating to 18.04 only Wayland works. Cannot get Xorg to work on Gnome Status in gdm3 package in Ubuntu: Incomplete Status in nvidia-graphics-drivers-390 package in Ubuntu: Incomplete Bug description: I recently updated to Ubuntu 18.04. After updating I can only log into Gnome if I select Gnome or Ubuntu with Wayland at my login screen. Nothing I can do will allow me tuse Xorg. I tried reinstalling Xorg and reinstalling my video driver (nvidia-390) . If I select Ubuntu with Xorg at login I get a purple screen and frozen mouse. If I set etting |WaylandEnable=false| in |/etc/gdm/custom.conf| I cannot get to the login screen. The system freezes. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1771661/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp