My USB keyboard is not working on my newly installed Ubuntu 13.04. but it works in GRUB menu.
This is the output of
dmesg | tail:
this issue is related with an old VIA
Mainboard : Unspecified P4M266-PM12-TL
Chipset : VIA P4M266 (VT8751)
I had to use a PS/2 keyboard. now I am happy to use Lubuntu. thanks