If you are using a USB-C dock then please see bug 1970495.
Otherwise if you think the USB-C port might be wired directly to the
Nvidia GPU then please see bug 1960865.
When the bug occurs next please:
1. Wait 10 seconds.
2. Reboot.
3. Run:
journalctl -b-1 > prevboot.txt
4. Attach the resulting text file here.
** Package changed: xorg (Ubuntu) => nvidia-graphics-drivers-510 (Ubuntu)
** Also affects: xorg-server (Ubuntu)
Importance: Undecided
Status: New
** Changed in: nvidia-graphics-drivers-510 (Ubuntu)
Status: New => Incomplete
** Changed in: xorg-server (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1973145
Title:
External monitor does not connect on USB-C
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