Disable (broken) nvidia drivers, enable nouveau drivers again ???

[linux guy]

I rebooted my computer tonight and got "Welcome to maintenance mode"

It happens for all the kernels I have loaded on the computer.

Its giving me obscure (to me) udevd errors.
udevd[

When I log in to maintenance mode and snoop around, everything seems
fine.   boot.log is clean, Xorg.0.log is clean, drives mount without
errors, etc.

Is this related to regenerating initramfs ?

Any ideas ?