If I'm not mistaken, there's a program which allows installation of DEB
packages downloaded by the user and also inform the user about the possible
dependencies conflicts.
I just can't remember if it is dpkg or Gdebi.
This would allow the user to download a package built for the base of the
operating system he is currently using, which in the case of GNU+Linux
Trisquel 6.0, is GNU+Linux Ubuntu 12.04.
I find this useful because I don't have to change repository sources.
Best regards, ADFENO.
Have a nice day.