The Chromium Browser can be installed through the apt package manager just like all your other software. First of all, you will have to update your software sources list. Type the command sudo gedit /etc/apt/sources.list in a terminal window and add the following two lines to the file:
deb http://ppa.launchpad.net/chromium-daily/ppa/ubuntu jaunty main
deb-src http://ppa.launchpad.net/chromium-daily/ppa/ubuntu jaunty main
This repository uses a GPG key, so you will have to add the key with the following command:
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 0xfbef0d696de1c72ba5a835fe5a9bf3bb4e5e17b5
Then update the sources list and install the browser:
sudo apt-get update
sudo apt-get install chromium-browser