When I try to install VirtualBox I get this message:
CD/DVD 'Ubuntu 12.10 Quantal Quetzal - Release i386 (20121017.2)' is required
I do not know what to do...
Go to /etc/apt/sources.list and delete the line deb cdrom:[Ubuntu 12.10 _Quantal Quetzal_ - Release i386 i386 (20121017.2)]/ quantal main restricted
.
sudo nano /etc/apt/sources.list
(or use any other editor on command line you like) or (with a GUI) gksudo gedit /etc/apt/sources.list
.