Chromium web browser, the open source version of Google Chrome has reached version 21. Thehas stopped updating the packages after version 18 was released. created a new ppa (for now) providing latest Chromium package for Ubuntu 12.04 Precise.
How to install the latest Chromium in Ubuntu 12.04:
Open terminal from the dash home or press Ctrl+Alt+T, execute this command to add this PPA:
sudo add-apt-repository ppa:a-v-shkop/chromium
sudo apt-get update
sudo apt-get install chromium-browser
If you have an old chromium installed, run this instead:
sudo apt-get upgrade