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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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
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