Add a Personal Package Archive (PPA)
Personal Package Archives (PPAs) are software repositories designed for Ubuntu users and are easier to install than other third-party repositories.
Only add software repositories from sources that you trust. Third-party software repositories are not checked for security by Ubuntu members, and may contain software which is harmful to your computer.
Install a PPA
On the PPA's overview page, look for the heading that reads Adding this PPA to your system. Make a note of the PPA's location, which should look similar to: ppa:mozillateam/firefox-stable.
Click on the Ubuntu Software Center icon in the Launcher, or search for Software Center in the search bar of the Dash.
When the Software Center launches, click Edit> ▸ Software Sources
You will be asked to enter your password. Once you have done that, switch to the Other Software tab.
Click Add and enter the ppa: location.
Click Add Source then close the Software Sources window. Ubuntu Software Center will then check your software sources for new updates.