Hrm... I've seen that kind of problem before, where Ubuntu won't let you do things.
Wish I could remember exactly what I did to circumvent it.
You could try sudo chown -R [username] [folder] where the username is you and the folder name is the top folder of the unzipped archive. Then try moving it. Don't forget you will have to change the owner back to root if this method works.
Oh! I think I cheated-- I booted up the machine into a Live CD (could have been Ubuntu, perhaps even DSL) and then moved the files on the hard disk-- the native Ubuntu root had no say in the matter, then.