How do remove the CD / DVD install as a source for apt-get packages when installing new features?

Solution 1:

Yes, you can remove the CD-ROM (or or original installation media) from the sources.list

Edit the sources.list file with the following command:

sudo nano /etc/apt/sources.list

And near the top, comment out the line that looks like this:

deb cdrom:[Ubuntu-Server 9.04 _Jaunty Jackalope_ - Release i386 (20090421.1)]/ jaunty main restricted

(comment is a hash (#) - so pop one of these at the start of the deb cdrom: ... line)

Press Ctrl+X to exit the nano text editor, pressing y to save your changes

Then finally you'll need to run:

sudo apt-get update

To update your package lists.

Solution 2:

For 12.04 and 12.10

This feature i.e auto enabling of the installation medium as software sources is disabled in this release. The section is empty now by default and will say this:

To install from CD-ROM or DVD, insert the medium into the drive

Here is a screenshot added

enter image description here

I think, this will be continued in the coming releases also.

Solution 3:

Go to System->Aministration->Software sources. Go to Ubuntu Software tab, at the bottom of the tab there is an option for CD/DVD. Selecting/deselecting it enables and disables CD/DVD as software source. Just un-check this option and your system will not look for Ubuntu CD or DVD