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I've managed to get it working by installing the 4.10 HWE kernel from Kernel/LTSEnablementStack - Ubuntu Wiki
sudo apt install --install-recommends linux-generic-hwe-16.04 xserver-xorg-hwe-16.04
I originally looked at amdgpu-pro-16.50 Segfault, 16.60 duplicate symbol, 16.40 init issue. and tried a kernel update, but must have messed something up.
A clean install, adding the amdgpu-pro driver, then install linux-generic-hew-16.04 is what worked for me.
Worked for me. Cheers
Also fixed things for me, thanks!