I have been using elementary OS 6 since it got released without many issues.
I updated the system through the app center yesterday, and was prompted to reboot.
After rebooting, the greeter goes into a loop. I can't log in, it just keeps flashing and starting up again. I barely see my user account and the mouse cursor for a second before it starts up again (basically flashes black, and then I see the top bar and a second later, I see my user account, then it goes black again)
I can't even go into TTY and log into my user account through the CLI. When I hit
F7, I see the CLI login prompt for a second and then I am immediately taken back to the greeter where I see the same loop.
I tried the following so far.
I booted into a recovery kernel and dropped down to root shell, then I uninstalled the NVIDIA graphics driver by running
apt-get remove --purge nvidia-*
This did not help. The only differences now are that the time I see the greeter top bar before it loops again is shorter, and I don't see the user account anymore; it flashes black and loops directly after the top bar appears.
I hadn't updated since two weeks before updating yesterday because I haven't used the laptop since a while, so there was a load of new OS updates.
the laptop has an NVIDIA GeForce GTX 1070 GPU
It's not a hardware problem because I successfully booted into a live boot session of Ubuntu through a USB thumb drive with Ubuntu 20.04 burnt on it