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 or reliability 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 Adding this PPA to your system. Make a note of the PPA's location, which should look similar to: ppa:mozillateam/firefox-next.
Click the Ubuntu Software Center icon in the launcher, or search for Software Center in the dash.
When the Software Center launches, click Edit ▸ Software Sources
Switch to the Other Software tab.
Click Add and enter the ppa: location.
Click Add Source. Enter your password in the Authenticate window.
Close the Software Sources window. Ubuntu Software Center will then check your software sources for new software.