Well, you'll need to be familiar with the cli, so check my first link.
The other link includes books on Ubuntu.
I'd also point out that
1. Ubuntu is based on Debian, so most Debian stuff sahould work on Ubuntu.
2. The basics of Linux are pretty much the same for all distros, so don't get too hung up on that particular name when googling; just research the actual problem you are trying to solve to start with.