Mixing repos from different distros (or even different versions of distros, which is what you'd need to be doing in order to be getting different versions - using the repos of a newer Ubuntu version) is not recommended. If you make your OS explode it'll be entirely your fault.

You realize that Ubuntu 16.04 LTS (Xenial Xerus) is coming out next month, right? And that Trisquel 8 is slated for "a final release not long after the upstream distro". So you realize you should be getting a major upgrade soon, right?

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