I sold my N800 (I know, I know) but since it acts like a normal linux system, it should be an easy fix.

My guess is that it was run as root before and the .lock file may have root permissions on it. If so, try to remove it (it should be off anyway if hamachi isnt running) so that the user 'user' can create it with the right permissions.

As a last resort, you can try to launch hamachi as root, I don't recall if that works or not.