Install amdgpu-pro packages on Debian (openCL, mesa, VCE) only.

install_amdgpu__vce_mesa_opencl.sh

#!/bin/bash

# -------------------------------------------------------------------------------------------------------------------------#
# 1st: Download the amdgpu-drivers from here: https://www.amd.com/de/support/kb/release-notes/rn-amdgpu-unified-navi-linux #
# -------------------------------------------------------------------------------------------------------------------------#

#=============================#
### CONFIG ###
# ADJUST VERSIONS ACCORDINGLY!
PACKAGE="amdgpu-pro"
VERSION="19.30-855429"
OS="ubuntu-18.04"
### CONFIG ###
#=============================#

if [ ! -f ${PACKAGE}-${VERSION}-${OS}.tar.xz ]
        then
                echo "Download the amdgpu-pro drivers first and adjust config for this script!"
                exit
fi

# prepare packages
tar -xvf ${PACKAGE}-${VERSION}-${OS}.tar.xz
cd ${PACKAGE}-${VERSION}-${OS}
mkdir unpack
dpkg-deb -R opencl-${PACKAGE}_${VERSION}_amd64.deb unpack/
cd unpack/
cd DEBIAN
mv control control.orig
grep -v "Depends: " control.orig > control
cd ..
cd ..
dpkg-deb -b unpack/ opencl-${PACKAGE}_${VERSION}_amd64_nodeps.deb
rm -r unpack/
# install needed deps
apt-get update
apt-get -y install vainfo clinfo libvdpau1
dpkg -i amdgpu-core_*_all.deb
dpkg -i amdgpu-pro-core_*_all.deb
# install openCL
dpkg -i opencl-amdgpu-pro-comgr_*_amd64.deb
dpkg -i opencl-amdgpu-pro-icd_*_amd64.deb
dpkg -i opencl-orca-amdgpu-pro-icd_*_amd64.deb
dpkg -i libdrm-amdgpu-common_*_all.deb
dpkg -i libdrm2-amdgpu_*_amd64.deb
dpkg -i libdrm-amdgpu-amdgpu1_*_amd64.deb
dpkg -i libopencl1-amdgpu-pro_*_amd64.deb
# install mesa
dpkg -i libllvm9.0-amdgpu_*_amd64.deb
dpkg -i libglapi-amdgpu-mesa_*_amd64.deb
dpkg -i libgles2-amdgpu-mesa_*_amd64.deb
dpkg -i libgles1-amdgpu-mesa_*_amd64.deb
dpkg -i libgl1-amdgpu-mesa-glx_*_amd64.deb
dpkg -i mesa-amdgpu-va-drivers_*_amd64.deb
dpkg -i mesa-amdgpu-vdpau-drivers_*_amd64.deb
# install Vulkan
dpkg -i libwayland-amdgpu-client0_*_amd64.deb
dpkg -i vulkan-amdgpu-pro_*_amd64.deb
# install VCE
dpkg -i opencl-amdgpu-pro_*_amd64_nodeps.deb
dpkg -i amf-amdgpu-pro_*_amd64.deb
cd ..
rm -r ${PACKAGE}-${VERSION}-${OS}/

Thanks for this. I used the 20.40 driver with Linux Mint 20.3 and ran into some dependency issues with the order of installation, as well as an inability to get to the desktop on reboot, but OpenCL worked.