This article is for 16.04, if you are looking for 16.10, it's here.

This article provides a list of many popular applications PPAs for Ubuntu 16.04 LTS Xenial Xerus. It provides PPA addresses for LibreOffice, GIMP, Inkscape, Scribus, SimpleScreenRecorder, OpenJDK, even GNU Ring, and some more applications (I listed only free software here, please tell me if I made any mistake).

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