Look at your /etc/apt/sources.list file. Usually, the first line or 2 has a configuration that tells apt to look for the installation CD. Normally these are commented out though. This is my sources.lst file from a 7.10 server that shows you what the lines look like. Simply remove the comment marks (#) from in front of the lines. Save the file and then type apt-get update at the command line. You will have to have the CD in the drive while updating:
/etc/apt/sources.list
Code:
# deb cdrom:[Ubuntu-Server 7.10 _Gutsy Gibbon_ - Release i386 (20071016)]/ gutsy main restricted
#deb cdrom:[Ubuntu-Server 7.10 _Gutsy Gibbon_ - Release i386 (20071016)]/ gutsy main restricted
Hope this helps!
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