to install the driver but after the reboot, I log in and everything is frozen. I don't see my desktop just the default grey screen without the logins fields. Then I hard reset and at the login screen I press Ctrl+Alt+F2 to open the terminal and purge the packages.1) apt-get install linux-headers-$(uname -r|sed 's,[^-]*-[^-]*-,,') nvidia-driver
2) apt-get install bumblebee-nvidia primus
How should I proceed?