Ubuntu Server 9.10 fails to find /cdrom/

[Ben Carr]

I am trying to install Ubuntu Server 9.10 on a Dell Poweredge SC420. 
However when I configure LVM on the hard drives I end up in a loop with 
the following error:
----------------------------
[!!]Install the base system
Please insert the disc labeled: 'Ubuntu-Server 9.10 _Karmic Koala_ - 
Release i386 (20091027.2)' in the drive '/cdrom'/ and press enter.

Media change
----------------------------
I have tried umount'ing /cdrom and remounting at: /cdrom /mnt/cdrom 
/target/cdrom and /target/mnt/cdrom all with no luck. I tried editing 
the sources.list file as well with no success.
Any ideas?
-Ben