Introduction to Linux: General Background This gives you an excellent view "at 30,000 feet" of
Linux and Linux distributions. If you have been using Linux, you will want
to hear this so you have a broader understanding of what is happening.
Basic Linux
Administrative Tasks for Ubuntu This gives you the basic facts of life
about installing, updating and removing software. You will learn about
installing servers for services such as ssh, mail and http. You will learn to
how to start and start serviess. He starts talking about navigating the
file system at about 41:00.
Installing Linux
(Ubuntu) shows you how to do both desktop and server installs. The
desktop version begins at about 27:30.