Mouse and keyboard unresponsive on login screen; cannot switch to tty

Question

So out of the blue my elementaryOS 5.1 has stopped responding on the login screen. Whereas yesterday everything worked perfectly fine, today I get stuck because both mouse and keyboard stop working entirely. Pressing ctrl-alt-f2 to switch to a different tty also yields no response.

The problem does not lie with the peripherals. They work perfectly fine in the BIOS, and I can navigate the grub boot menu just fine. It looks more like the entire system just crashes as soon as the login screen shows up? The cursor for entering the password to login is initially blinking, but stops and freezes after a few seconds.

I have not updated anything, nor installed any new software. I have ample space, my harddrive is half empty. I've found no solutions to this problem, and no person experiencing the exact same issue.

Benjamin Ye · Answer

I had the exact issue. After rebooting my computer, my mouse and keyboard were completely unresponsive and I noticed that a blinking cursor on one of my start-up programs became and stayed solid, suggesting that my entire system had crashed.
I'm not sure if you're still having the issue, but I was able to solve my issue by reinstalling input devices:
sudo apt-get install --reinstall xserver-xorg-input-all

Mouse and keyboard unresponsive on login screen; cannot switch to tty

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