20.04 – Computer freezes on startup

I am using Ubuntu 20.04, a fresh install.

I installed all of the latest updates, and now when the computer is starting up, it shows a black screen with the mouse visible, but is entirely unresponsive. The only thing that could have affected it was that I installed the linuxwacom driver (that maps buttons to Xinput events) and then shut down.
Starting back up, it does exactly what I described above.

Please help!

Thanks!

EDIT 1:
I can access the motherboard’s BIOS. (By holding the power button for 4 seconds)
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