Hello,
in my case (not 100% sure) the last working was nvidia-driver-450 (450.102.04-0ubuntu0.20.04.1). The one rolled out in Ubuntu 20.04.1 before the actual 460.80, if I am correct.
Though I have a similar machine with 1080ti (also U20.04.1) where 460.80 is working like before. Maybe this bug-report.sh would be useful?