I am assuming you're using the same CD that you installed Ubuntu with.
Can you go to the CD on your system?
For example something like:
ls /media/cdrom0
** Changed in: cdrom-checker (Ubuntu)
Sourcepackagename: openssh => cdrom-checker
Status: Unconfirmed => Needs Info
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apt-get install asks for cd then system can't see any disks
https://bugs.launchpad.net/bugs/117807
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ubuntu-bugs mailing list
ubuntu-bugs@lists.ubuntu.com
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