I found a solution at this link
http://askubuntu.com/questions/276493/keyboard-not-working-on-lg-laptop
"I found a working solution to the problem.
You need to edit the file /etc/default/grub
$ sudo gedit /etc/default/grub
Go to the line GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" and edit it
to:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i8042.nopnp=1
i8042.dumbkbd=1"
Update grub
$ sudo update-grub
Reboot your computer."
The keyboard is now normally working.
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https://bugs.launchpad.net/bugs/1338555
Title:
Keyboard completely unresponsive
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