Possible Duplicate:
Nothing shows up on the screen when I type my password
I can open a terminal (Ctrl-Alt-T)
I can copy or type in the following:
sudo wget http://www.medibuntu.org/sources.list.d/oneiric.list -O /etc/apt/sources.list.d/medibuntu.list
When prompted for password, I cannot enter anything via keyboard.
Any clues?