Radeon R9 M390 Ubuntu 16.04 Driver Installation
How to Download and Install Radeon R9 M390 Ubuntu 16.04 Driver.
The following Instructions shows the AMD Radeon Software Crimson Edition Proprietary Linux Graphics Driver Installation.

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Open a Shell Terminal emulator window
Ctrl+Alt+t on desktop
(Press “Enter” to Execute Commands)In case first see: Terminal QuickStart Guide.
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Download AMD ATI Radeon Driver for Ubuntu
Grab the Ubuntu 15.04 Version.
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Double-Click on Archive and Unzip into /tmp.
Or from Shell:unzip -d /tmp/ radeon-crimson*.zip
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Run the Radeon Ubuntu Driver Installer
Change to the Target directory:cd /tmp/fglrx*
Execute the script with:
sudo ./amd-driver-installer*.run
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Then Follow the Installation Wizard.