I was looking for a way to disable the built-in webcam on an Acer-laptop. Ubuntu, well Linux Mint actually, tried to identify and use the webcam during boot, over and over again. This caused a huge delay in booting time. Since I don’t want to use the webcam, I searched for a way to disable it. Adding “blacklist gspca” to the file “/etc/modprobe.d/blacklist” did the trick. Now the thing boots in 1 minute