Comment # 26 on bug 110795 from Felipe Marschall

(In reply to Rolf from comment #3)
> If anyone else finds themselves in this fix by installing this driver, the
> only way to get apt-get working again is to forcefully remove all of the
> files using:
> 
> sudo dpkg --force-all -P [package name]
> 
> Here is the list of miss-installed packages:
> 
> 
> The following packages have unmet dependencies:
>  amdgpu-dkms : Depends: amdgpu-core but it is not going to be installed
>  amdgpu-lib : Depends: amdgpu-core (= 19.10-785425) but it is not going to
> be installed
>  ...

It happened to me now...
I managed to fix it by booting into recovery, enabling network and then
running:

dpkg --remove --force-remove-reinstreq amdgpu amdgpu-core amdgpu-dkms
amdgpu-lib glamor-amdgpu gst-omx-amdgpu libdrm-amdgpu-amdgpu1
libdrm-amdgpu-common libdrm2-amdgpu  libegl1-amdgpu-mesa
libegl1-amdgpu-mesa-drivers libgbm1-amdgpu libgl1-amdgpu-mesa-dri
libgl1-amdgpu-mesa-glx libglapi-amdgpu-mesa  libgles1-amdgpu-mesa
libgles2-amdgpu-mesa libllvm7.1-amdgpu libomxil-bellagio-bin libomxil-bellagio0
libosmesa6-amdgpu  libwayland-amdgpu-client0 libwayland-amdgpu-egl1
libwayland-amdgpu-server0 libxatracker2-amdgpu mesa-amdgpu-omx-drivers 
mesa-amdgpu-va-drivers mesa-amdgpu-vdpau-drivers
xserver-xorg-amdgpu-video-amdgpu