As explained in https://wiki.ubuntu.com/Bugs/FindRightPackage
Graphical Environment The Ubuntu graphical environment is provided by a combination of the Linux kernel and the X Window System (aka X.org). The following symptoms typically are due to GPU issues in the kernel DRM driver (linux package): Blank or solid-colored screen instead of login screen, or immediately after login System freezes completely Wrong default screen resolution ** Package changed: ubuntu => xorg (Ubuntu) -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/2077825 Title: wrong screen resolution To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/2077825/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp