What is PPA?
PPAs are for non standard software/updates. They are generally used by people who want the latest and greatest. If you are going extra lengths to get this kind of software, then you are expected to know what you are doing. The selection in the Software Centre is ample for most human beings.
Add PPA For Ubuntu 15.04 and newer
Before adding a PPA you should be aware of some of the risks involved:
Always remember that PPAs are provided by the community, you should be aware of the possible risks before just adding a PPA.
Add PPA by command line.
sudo add-apt-repository ppa:chromium-daily/ppa sudo apt-get update sudo apt install chromium
Add PPA by GUI
First search for Software and updates and launch it.
Now switch to other software tab.
Now click 'Add', a box will appear.
You have to enter the PPA in the box. It can be found in BOLD on the launchpad page.
Now click 'Add source' and close the Software Sources. The cache will be refreshed
Now install the software from the software center.