Chromium web browser, the open source version of Google Chrome has reached version 21. The Chromium daily build ppa has stopped updating the packages after version 18 was released. Tobias Wolf 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

Update source:

sudo apt-get update

Install Chromium:

sudo apt-get install chromium-browser

If you have an old chromium installed, run this instead:

sudo apt-get upgrade