Looks like you ran into a driver bug with 430.50 where the gpu thinks it has no outputs. Try adding the graphics ppa and update to 440. Alternatively, run
grep nvidia /etc/modprobe.d/* /lib/modprobe.d/*
to find a file containing
options nvidia-drm modeset=1
and change 1 to 0
then run
sudo update-initramfs -u
and reboot.