Failed to fetch cdrom://Ubuntu 10.04.1 LTS _Lucid Lynx_ - Release amd64 (20100816.1)/dists/lucid/main/binary-amd64/Packages.gz  Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs

i then tried to run 'sudo apt-cdrom add' and got this

Using CD-ROM mount point /media/apt/
Identifying.. 
E: Unable to stat the mount point /media/apt/ - stat (13: Permission denied)
W: Failed to mount '/dev/sr0' to '/media/apt/'
E: Unable to change to /media/apt/ - chdir (13: Permission denied)