Enable PS/2 Keyboard in Ubuntu 12.04 Apr 3, 2014 Installing Ubuntu 12.04 on one of our servers, it turned out that the PS/2 keyboard didn’t work. Luckily, only a few steps were required to make it work - so if you’ve got the same problem, you might give it a try: $ sudo vi /etc/default/grub # Change # GRUB_CMDLINE_LINUX="" # to # GRUB_CMDLINE_LINUX="i8042.nopnp" $ sudo update-grub And restart.