INSTALLING SOFTWARE ON UBUNTU
The use of the Terminal in most cases is not needed as Ubuntu has the Synaptic Package Manager which allows you to easily install and remove software
Here is the Official Ubuntu Synaptic Package Manager Documentation
https://help.ubuntu.com/community/SynapticHowto
If you do need to use the Terminal
Here is the Official Ubuntu Terminal Documentation
https://help.ubuntu.com/community/UsingTheTerminal
You can Copy and Paste commands
To install individually downloaded deb. files then Ubuntu has the GDebi Package Installer (built in to Ubuntu) which automatically starts up when you try to open a deb.file
http://allmyapps.com/app/ubuntu-9.04/gdebi-gdebi-package-installer
Guide to installing software on Ubuntu
http://www.psychocats.net/ubuntu/installingsoftware
UBUNTU USER GUIDE
Ubuntu 9.04 (Jaunty Jackalope) User Guide
http://ubuntuguide.org/wiki/Ubuntu:Jaunty
CURRENT SESSION
Linux Mint 7 ext4 GRUB 2 with Compiz 0.8.2
http://www.linuxmint.com/edition.php?id=38
http://wiki.compiz-fusion.org/
LUg.