Comment 23 for bug 1752739

@Roman: I got the same error about blacklist.nvidia missing when running prime-select nvidia until I did an apt --purge remove nvidia-prime and then apt install nvidia-prime. I think the package must have accidentally left old code in place when it upgraded.

After that, I was able to change to use nvidia, but gdm still booted into intel because nouveau and nvidia were both being loaded. I added a conf file in /etc/modprobe.d containing "alias nouveau off" to fix that.

After that, gdm still fails to boot into nvidia (I get the same divide by zero error as Doug does, see the log in comment #10). lightdm doesn't crash but I only get a black screen so I can't log in to it.