Thanks J.B. Nicholson-Owens,I will give your suggestion a try. I don't need that docker, I actually thought I had deleted docker, but it still keeps trying to fetch that for some reason. I didn't know you could edit that, so it's nice to learn something new.
I have commented that out from /etc/apt/sources.list So now I'll try to upgrade to Trisquel 8 and see if it works!
