GNU/Linux Ubuntu 18.04 Install Radeon RX 480 Driver
The linked tutorial shows you step-by-step How to Install AMD Radeon RX 480 Driver for Ubuntu 18.04 Bionic LTS GNU/Linux 64-bit.
And there are 2 Radeon RX 480 Ubuntu Bionic 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.
Especially relevant: a simple Updgrade to Ubuntu 18.04.4 Release may be Required presious to this Setup.
Finally, for the Radeon Open Source Drivers on Repo See instead: How to Install AMDGPU from Ubuntu PPA.

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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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