Hello I sucessfully managed to install amdgpu-pro in a fresh install of ubuntu 18.04.1
uname -r
4.15.0-29-generic
lspci | grep VGA
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Cape Verde PRO [FirePro W600]
/usr/sbin/dkms status amdgpu | grep `uname -r` | grep installed
amdgpu, 18.20-621984, 4.15.0-29-generic, x86_64: installed
modinfo amdgpu
filename: /lib/modules/4.15.0-29-generic/updates/dkms/amdgpu.ko
version: 18.20.2.15
license: GPL and additional rights
description: AMD GPU
author: AMD linux driver team
firmware: amdgpu/raven_gpu_info.bin
....
....
However, I only manage to start the system with nomodesting. If I remove nomodesetting from the grub parameters, the system launches to a black/blank screen.
What can be the problem? thanks!