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What kernel and nvidia driver versions are you using? There was a major change in kernel 5.9 which prevented nvidia_uvm loading and required Nvidia to rewrite some of their driver. IIRC the nvidia 455.xx driver is the first to have fixed this.
“ computer users can be divided into 2 categories:
Those who have lost data
...and those who have not lost data YET ”Remember toBACKUP!
nvidia-driver 455.45.01-1 is currently in experimental. Either wait for it to be moved to sid or temporarily enable the experimental repo, install it, and then disable the repo.
Installing from experimental can be like playing Russian roulette; mostly it will go ok but occasionally you get a bullet in the head. I've heard a couple of reports of successfully installing this driver version in sid but YMMV.
“ computer users can be divided into 2 categories:
Those who have lost data
...and those who have not lost data YET ”Remember toBACKUP!