In Additional Drivers under Software & Updates, the NVIDIA driver is stuck on Continue using a manually installed driver, and all other options are greyed out.
I want to set the driver to proprietary driver(
nvidia-driver-390), which was originally selected before I changed it to the open source driver, but now it is stuck.
How can I resolve this issue? Should remove all NVIDIA drivers and install them again? If so , how to do it safely in Ubuntu 20.04?