GNU/Linux Ubuntu 20.04 Installing Radeon RX 6900 XT Driver
How to Install AMD Radeon RX 6900 XT Graphics Driver for Ubuntu 20.04 Focal LTS GNU/Linux 64-bit desktop.
And there are 2 Radeon RX 6900 XT Ubuntu Focal Graphics 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.

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1. Launching Shell Emulator
Open a Terminal window
Ctrl+Alt+t on desktop
(Press “Enter” to Execute Commands).
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