In addition to what jxself said, I want to point out that some packages have been modified by Debian or Trisquel packagers to remove non-free pieces. In cases like those, you may suddenly have those non-free pieces if you get a new version from a PPA. If you're going to use PPAs, always check it: make sure that it is fairly trustworthy (e.g. maintained by the developers of the program) and make sure that there are not non-free pieces in it.

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