[Trisquel-users] Re : alternative DE repos truly free?

[lcerf]

PPAs are not "Ubuntu repositories". They are not available in Ubuntu by  
default. Ubuntu's users can add them in the same way as Trisquel's users can  
(e.g., using 'sudo add-apt-repository' or through the "Other Software" tab of  
"Software & Updates" in the "System settings").

PPAs are "Personal Package Archive". Anybody can make one. And Canonical can  
host it. But the PPA neither is controlled by Trisquel nor by Ubuntu. It may  
include proprietary software or even malware. Even if it does not now, it  
could tomorrow along an apparently trifling update. Adding a PPA is trusting  
whoever is behind the PPA. If you do not trust him/her/them, then install  
from source...