This is a quick brush-up on on the commands that you'll be seeing in the ubuntu related pages.
sudo - 'SuperUser do' - used to execute a cammand with administrative rights. First time you use it (in each session) you'll be prompted to type in your password.
apt-get - Used to install packages from the repositories registered on the client. It's simply a command-line equvivalent to installing the package using Synaptic Package Manager (System -> Administration -> Synaptic Package Manager).
- Adds a repository to the computer. The command-line eqvivalent doing System ->
Administration -> Software Sources from the GUI.
apt-key - installa a certificate, that protect some repositories.
wget - fetches the URL and saves it to your local harddrive
dpkg - a pendant to apt-get - used to install debian packages.
unrar - decompresses archived files. (
unlink (...) - siffrente commands used to throw around with files and directories.
sh - executes shell scripts.