Anyone else run into this problem? I've booted from an Ubuntu Live CD and I've got all the files on my hard drive listed in a window using "gksu nautilus". The iMac I've connected to via Firewire is mounted, along with an external LaCie drive. However, when I try to move any of the files from the hard drive to these volumes, i get "The destination is read-only". These volumes certainly aren't read-only, as they are freely accessed in any direction from from OSX.

Any suggestions?