GNU/Linux Ubuntu 20.04 Installing Radeon RX 5500 XT Driver
Hi! The linked Tutorial shows you Step-by-Step How to Install AMD Radeon RX 5500 XT Driver for Ubuntu 20.04 Focal LTS GNU/Linux.
And there are 2 Ubuntu Focal Radeon RX 5500 XT Graphics and GPU Driver available Alternatives: the AMDGPU Pro and the AMDGPU Open-Source.
Moreover, the AMDGPU Pro Software includes Support for Accelerated Graphics, MESA Multimedia, Pro OpenGL, Pro Vulkan and Pro OpenCL.
Especially relevant, the Latest Driver supporting a Device varies over Time, so before the Setup you should check: AMD Radeon Drivers Support
Finally, for the Radeon Open Source Drivers on Repo See instead: How to Install AMDGPU from Ubuntu PPA.
Installing Radeon RX 5500 XT Ubuntu 20.04 Driver
How to Install Radeon RX 5500 XT Driver for Ubuntu
Amdgpu Pro Driver Ubuntu 20.04 Setup Guide