Installing Chromium

If you are among those who have yet to take the plunge to use a version of Google Chrome or the open-source Chromium, I highly recommend you give it a try. This HowTo will walk you through installing Chromium using the daily builds provided through a Personal Package Archive (PPA) at LaunchPad.net. There are no deep secrets in this article; all the information I'm about to provide can be found at the PPA page at LaunchPad (https://launchpad.net/~chromium-daily/+archive/ppa). To make this as user friendly as possible, I'll demonstrate the steps to take through the Ubuntu sources list GUI. To update your sources to include the packages from the PPA for Chromium, you will need to use the following:
deb http://ppa.launchpad.net/chromium-daily/ppa/ubuntu karmic main
deb-src http://ppa.launchpad.net/chromium-daily/ppa/ubuntu karmic main
To get Ubuntu to add these package sources to your source list, go to:
System > Administration > Software Sources. Then select the Other Software tab. Once there, select the Add... button, and, in the APT line text box, enter the first line from above (note that you should substitute your version of Ubuntu in the place of 'karmic' as appropriate). Repeat this step for the second line above.
Ubuntu isn't going to be happy to trust this third-party source you've just added. To alleviate this you will need to authenticate the source with the proper GPG key. This can be accomplished through the GUI, but this step is easily accomplished through the terminal. Open your terminal and execute the following command:
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 4E5E17B5
And now you're finished. Refresh your package listing either through the Software Sources applet, or just execute apt-get update from the terminal. To get Chromium via the terminal: sudo apt-get install chromium-browser
And, after that runs its course, you've got one of the best running browsers today running on Ubuntu, based on my experience. If you happen to be running Karmic you can add a new software source, and its key, with:
sudo add-apt-repository ppa:chromium-daily
And, just like that, I've made my little HowTo obsolete.

Source : Full Circle Magazine #32