ERROR: Failed to initialize the NVIDIA GPU at PCI:1:0:0

solution found on this site:
https://github.com/Bumblebee-Project...bee/issues/542

changing
Code:
GRUB_CMDLINE_LINUX_DEFAULT="quiet"
to
Code:
GRUB_CMDLINE_LINUX_DEFAULT="quiet rcutree.rcu_idle_gp_delay=1"
in /etc/default/grub.
I tried it and it worked