Release page
https://www.amd.com/en/support/kb/release-notes/rn-rad-lin-19-20-unified says:
To use the Vulkan driver in this stack, Vulkan SDK version v1.1.106.0 needs to
be installed. The SDK can be downloaded from:
https://vulkan.lunarg.com/sdk/home

But in 19.20-812932 release for Ubuntu in
vulkan-amdgpu-pro_19.20-812932_amd64.deb in
opt/amdgpu-pro/etc/vulkan/icd.d/amd_icd64.json I can see:
"api_version" : "1.1.108"

So I guess that it may require a newer version.

And is it even required? In Arch Linux there was a package created for this
https://aur.archlinux.org/packages/lunarg-vulkan-sdk/ and I am wondering if
that should be deleted.