How to add Universe and Multiverse repository

Important note: Most of the howtos in this forum need the Universe and Multiverse repositories to be enabled.

By default, Ubuntu does not enable the Universe and Multiverse repositories. But they include some important programs and codecs, so it is highly recommended to activate them. There may also be non-Ubuntu sources that you might wish to add to your Ubuntu machine.

The repositories (of apt) are stored in a file called /etc/apt/sources.list

First you should create a backup of your existing sources.list file:
sudo cp /etc/apt/sources.list /etc/apt/sources.list_backup

Next you edit the sources.list file with an editor like GEdit.
sudo gedit /etc/apt/sources.list

There is an incode documentation. Uncomment everything you need, especially the universe and multiverse repositories.

If you prefer to do it graphically with the apt-frontend Synaptic, there is a detailled manual with screenshots at https://wiki.ubuntu.com/AddingRepositoriesHowto.

adding

    I am trying to get a machine to recognize and use the nic card that is there.When I try to use ubuntu device database, I get through the sound, mouse and video test, but it just hangs at the network test.When I try to use Synaptic, or go to network tools, or a dozen other things, I get: "Could not launch menu Item- Setails failed to execute child process "/home/qwondre/" permission deniedI did a passwd reset but still get permission denied.Im way to lazy to want to hassle with linux/ubuntu at this levelI just got a few more things added from the cd but no internet connection.Im going t move it into another room to a known good internet connection.....just a minute.

Chicken/Egg?

So if I need to update, but can't get network connection to do the update, then how do I update this brand new (not even 1 day old) installation of Ubuntu 9.10 so that I can get an internet connection?