apt-get asks me to insert CD, why? [duplicate]
Solution 1:
If you have an internet connection, you can safely comment out the line starting with deb cdrom: .... in the file /etc/apt/sources.list. You can edit this file with the command:
sudo gedit /etc/apt/sources.list
and simply prepend this line with the #-sign so that it looks something like this:
# deb cdrom:[Ubuntu 12.10 _Quantal Quetzal_ - Release amd64 (20121017.5)]/ quantal main restricted
Save the file and don't forget to run
sudo apt-get update