I am trying to install nvidia-driver (440) on my Ubuntu on my laptop.  After a lot of failed attempts to install drivers properly I followed this instruction, which seemed good: https://askubuntu.com/questions/1050423/cannot-get-nvidia-graphics-card-to-work-on-ubuntu-18-04  Unfortunately, this doesn’t help. Even with the secure boot disabled I still got a black screen saying “/dev/sdb1: clean, 666666/14881488 files, 69696969/420420420 blocks” instead of normal lightdm user experience.  The inter...