I'm trying to apply a patch to a package and I don't seem to have patch installed, but when I type
sudo apt-get install patch it gives me this message:
Ubuntu 11.10 Oneiric Ocelot - Release amd64 (20111012)'
in the drive
/cdrom/ and press enter
How can I install it? Cuz I actually have the installation cd on my drive, but nothing happens.