GNU/Linux Trisquel 9 Installing AMD Open Source Drivers Guide
Hi! The Tutorial shows you Step-by-Step How to Install AMD Radeon and ATI Open Source Graphics and GPU Drivers in Trisquel 9.x GNU/Linux Desktop.
And Open Source AMDGPU Graphics Drivers for Trisquel Linux includes Updated Free Graphics Drivers for AMD Graphics Cards.
Especially relevant: as a complement you may be intesested also to the MESA Graphics Drivers Suite Setup.

1. Launching Shell Emulator
Open a Terminal window
(Press “Enter” to Execute Commands).