If you have a symlink to a disk that is not auto-mounted, then clicking on it gives an error message like "The Link "My Pictures" is Broken. Move it to the Rubbish Bin? This link cannot be used, because its target "/media/Acer/Users/Steven/Pictures/My Pictures" doesn't exist."
For a beginner this message is startling, and suggesting that it should be deleted worrying, and not particularly helpful.
The best option from a usability point of view would be to mount the disk, but I bet that's hard to do.
Second best, do not offer to delete it, and say something along the lines of "The file or directory that "My Pictures" links to (/media/Acer/Users/Steven/Pictures/My Pictures) is not currently available. You should check that the disk is mounted."
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: nautilus 1:3.2.1-0ubuntu4.2
ProcVersionSignature: Ubuntu 3.0.0-17.30-generic 3.0.22
Uname: Linux 3.0.0-17-generic x86_64
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Tue Apr 17 22:35:28 2012
ExecutablePath: /usr/bin/nautilus
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
SourcePackage: nautilus
UpgradeStatus: No upgrade log present (probably fresh install)
Thank you for taking the time to report this bug and helping to make Ubuntu better. The issue you are reporting is an upstream one and it would be nice if somebody having it could send the bug to the developers of the software by following the instructions at https:/