Messing around with Ubuntu #2

Oops, I made an error on the last post. I did not in fact get root, since I started up bash with the sudo command I was running it as root, not as sam. Attempting to switch back to user "sam" while in bash as root does not work as even as root, I get "Cannot execute /bin/bash: Permission denied". I am confounded and I have no idea why this does not work. It is an issue I will have to pick up again later.