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I am running Ubuntu 18.10. I think I received a kernel update to 4.18.0-12-generic and the screen keeps on flickering. I have RX480
sudo apt purge screen-resolution-extra*
sudo apt install xserver-xorg xserver-xorg-video-amdgpu
sudo apt-get install --reinstall xserver-xorg-core libgl1-mesa-glx
Required, but never shown
3 months ago