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)
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https://bugs.launchpad.net/bugs/2077825
Title:
wrong screen resolution
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