You will have to go to it as root the get around this problem. It happens from
time to time. Use 'gksu nautilus' or 'kdesu konqueror' to start a file manager
as root, depending if you are in Gnome or KDE. Then you will have to navigate to
your Trash folder. (Remember: when you open Nautilus or Konqueror you will be in
the root home folder and not your own). The Trash folder is a hidden folder in
your home folder for most distros. You will need to change your file manager to
show hidden files to find hidden folders which have a dot before the name.

In Hardy Heron the folder is at: ~/.local/share/Trash/ (where ~ is your home
folder).