Re: Can't remove Ubuntu One - missing "Password" menu item
You may need to remove and reinstall U1 completely. There are instructions for doing that on the U1 website. That involves removing the configuration and keys in your home directory, not just the software. (You may not need to remove the software at all, actually.)
I think that seahorse is installed by default on 12.04 Try entering "seahorse" in the dash if on unity, or look for "passwords and keys" (or something similar) in the system-preferences menu if using gnome-fallback.
If it's not there, sudo apt-get install seahorse should install it.
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Please, people, remember to BACKUP before you install that new system. Same if you're upgrading.