This happened to me when upgrading ONLINE, not with a CD !
I upgraded from 9.04 to 9.10 via the update manager through the internet, I had
no CD in the drive.
Yet I got the question Please insert the disk Karmic Koala .. Release
amd64 (20091027) ..
I just continued to click OK and the
I have an Epson printer.
This problem occurred after upgrading from 9.04 to 9.10, the printer worked
fine before the upgrade.
I first tried the commands as described below, seen on another forum:
sudo chown -hR root /usr/lib/cups/filter
sudo chown -hR root /usr/lib/cups/backend
sudo chgrp -hR
