We are sorry that we do not always have the capacity to review all
reported bugs in a timely manner. You reported this bug some time ago
and there have been many changes in Ubuntu since that time.
Ubuntu 16.04 (xenial) reached end-of-standard-support on April 29, 2021.
Do you still see a problem
It looks like you have upgraded from an older version of Ubuntu and were
using the proprietary NVidia driver on that older version. Is this
correct? If so, it looks like the proprietary NVidia driver was not
configured/upgraded correctly during the Ubuntu upgrade. Try installing
the proprietary
