Install a PPA
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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.
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Click the Ubuntu Software icon in the Dock, or search
for Software in the Activities search bar.
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When Ubuntu Software launches, click Software & Updates
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Switch to the Other Software tab.
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Click Add and enter the PPA's location (as noted in step 1).
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Click Add Source. Enter your password in the Authenticate
window.
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Close the Software & Updates window. Ubuntu Software will then
check your software sources for new software.