I'm pretty sure that Trisquel 8 has the free driver package here: https://mirror.fsf.org/trisquel/pool/main/x/xserver-xorg-video-ati/?C=M;O=D

Should be a simple matter of:
$ sudo apt install xserver-xorg-video-radeon

I don't have an AMD system with Trisquel to try it, but radeon is the free driver for the Cedar Radeon HD 5000/6000/7350/8350 Series from what I've read.

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