Yesterday there was a Kernel Update for 5.11.0-34. It doesn't seem to want to play well with NVidia drivers, touchpads, keyboards, etc. My main desktop (with NVidia) is one of these also. Reinstalling the 3rd party NVidia driver with this Kernel does not seem to bring it back.
I'm sure they will have this sorted out soon. (Hopefully)
#### Instructions to boot and be temporarily Normal ####
At BIOS Post, start hitting the left-shift key, so that the Grub Menu Displays...
When it comes up, press <E> key to edit the Grub Boot line. Use the down arrow until you get to the line that start's with "linux"...
Use the right arrow, until the cursor is where it says "quiet splash". Delete "quiet". Arrow right of "splash" and add "nomodeset"...
Press <Cntrl><X> to boot... It should boot normally.
##### Instructions from there #####
You could update/edit your Grub default file, to add nomodeset as a kernel boot parameter, until this gets sorted out (remembering to updaet-grub to pick up that change), select an earlier kernel to boot from each time you boot, or for the time being, change to using the Nouveau driver.
To do that- At the Desktop, "Activities", type "Software & Updates"... Select it. "Additional Drivers Tab" > Nouveau Driver...
For instruction on editing the Grub Default file, check post #1 of my Graphics Resolution sticky in my Signature line.
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