At this point, it appears that the Chromium Project pages on Launchpad have become inactive and out of date. The last dev, beta, and daily successful builds from this particular project were made about 65 weeks ago(over a year).
Currently, there is a PPA dev build available as well as two Debian/Ubuntu channels(dev and beta ) provided be Google: that provide deb packages for installation. See The Chromium projects page for additional information.
Dev channel for Debian/Ubuntu provided by Google
Beta channel for Debian/Ubuntu provided by Google
Launchpad chromium-dev PPA
There is a chromium dev build(>= version 29.0 at this time) available as a PPA here.
Installation from the command line:
The latest dev PPA can be obtained by running the following commands from the terminal(Ctrl-Altt):
sudo add-apt-repository ppa:saiarcot895/chromium-dev
sudo apt-get update
sudo apt-get install chromium-browser
Installation from the Synaptic Package Manager:
Select Settings --> Repositories --> Other Software --> Add and enter: deb http://ppa.launchpad.net/saiarcot895/chromium-dev/ubuntu YOUR_UBUNTU_VERSION_HERE main
Select Add source. Next, select the Reload button on the menu to re-index your package list
In the Quickfilter field, enter "chromium" and you will see the latest versions of the packages available for installation from this project.
Finally, mark the packages that you are interested in, and click the Apply button.
I have not personally tested this build. Take a look at launchpad for more details on this PPA.
The last successful build (29.0.1547.0-0ubuntu0ppa3) occurred on 6.26.2013 is available for saucy, raring, quantal, precise, and oneiric.
NOTE: Some Chromium features, including Sync, require an API key, which is not included with the packages below. See the launchpad page for additional configuration instructions.
See here for the stable release:
Always remember that PPAs are provided by the community, you should be aware of the possible risks before just adding a PPA.