It sounds like the Nvidia driver is not happy with the new kernel.
Please try booting an older kernel or forcefully reinstalling the Nvidia
kernel driver:
sudo apt install --reinstall nvidia-dkms-460
and then reboot.
You can also find other kernels to test at https://kernel.ubuntu.com
/~kerne
** Package changed: ubuntu => xorg (Ubuntu)
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https://bugs.launchpad.net/bugs/1919364
Title:
After update display resolution is only 640X480
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