The upgrade to 10.10 wasn't showing up in the Update Manager, so I torrented the alternate ISO, mounted it, and ran cdromupgrade. It all ran smoothly, until I started my computer back up and ran the Update Manager. It said I needed to insert a disc. I ran "sudo apt-get update", and the output was this:

Media change: please insert the disc labeled
'Ubuntu 10.10 _Maverick Meerkat_ - Release i386 (20101007)'
in the drive '/cdrom/' and press enter

How do I remove the dependency on the ISO?