19.20-812932 release for Ubuntu PX package xserver-xorg-video-modesetting-amdgpu-pro is not provided, so maybe just remove any mentioning about it from installer script and from documentation? Here: https://amdgpu-install.readthedocs.io/en/latest/install-installing.html#px-platform-support-ubuntu-only
We have no control over that docs website. Try to raise the issue or send an MR on their repo: https://gitlab.com/amdgpu/docs/amdgpu-install
TIL AMD does its support via our bugzilla...
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