Thank you for responding. I tried to restart, but all I got was a
flashing cursor in the top left of my screen. So, in the end, I had to
reinstall Ubuntu from scratch. The same problem re-occurred again, and
forced me to re-install from scratch a third time. This last time, from
the very first boot
Public bug reported:
Suspend, restart and power off simply don't work. The system crashes,
logs me out and takes me back to the log-in screen. It possibly has
something to do with the Nvidia driver (460), but is the same with the
Nouveau driver enabled. I used system76-power previously to set Nvid
