how to install ubuntu tweak in ubuntu by adding its source

How to add the source of Ubuntu Tweak (The easy way, work since Ubuntu 9.10):

Go to System / Administration / Software Sources, click on Other Software tab, click Add button, and enter "ppa:tualatrix/ppa".

This will add the PPA repo and the GPG key automatically.

You can also do it from command line by running:

sudo add-apt-repository ppa:tualatrix/ppa

How to add the source of Ubuntu Tweak

open your terminal, first import the key:

sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com FE85409EEAB40ECCB65740816AF0E1940624A220

type the command to run gedit(or other editor in your opinion) to modify the sources.list:

sudo gedit /etc/apt/sources.list

And put the two line into it(If you are using Ubuntu 8.04 Hardy or early) :

deb http://ppa.launchpad.net/tualatrix/ppa/ubuntu hardy main
deb-src http://ppa.launchpad.net/tualatrix/ppa/ubuntu hardy main

Or Ubuntu 8.10 Intrepid:

deb http://ppa.launchpad.net/tualatrix/ppa/ubuntu intrepidmain
deb-src http://ppa.launchpad.net/tualatrix/ppa/ubuntu intrepid main

Or Ubuntu 9.04 Jaunty:

deb http://ppa.launchpad.net/tualatrix/ppa/ubuntu jaunty main
deb-src http://ppa.launchpad.net/tualatrix/ppa/ubuntu jaunty main

Or Ubuntu 9.10 Karmic:

deb http://ppa.launchpad.net/tualatrix/ppa/ubuntu karmic main
deb-src http://ppa.launchpad.net/tualatrix/ppa/ubuntu karmic main

Then update the source and install or upgrade Ubuntu Tweak:

sudo apt-get update
sudo apt-get install ubuntu-tweak

if you have installed, just type:

sudo apt-get dist-upgrade