Please don't add nouveau driver into blacklist if failed to install cuda

I got black screen after running sudo sh failed and then reboot.

That’s because generated a blacklist to block loading nouveau driver.

Now I’ve to enter rescue mode to delete /etc/modprobe.d/nvidia-installer-disable-nouveau.conf

So, can you generate blacklist ONLY after installing successfully?

P.S. In a installation tip:
Existing package manager installation of the driver found. It is strongly
recommended that you remove this before continuing.

But what’s this stand for in above tip?
Remove package manager? Remove the driver? Remove which driver exactly?
So it’s better to show what’s this exactly.
Please show it exactly to avoid confusion.