Opensource AMDGPU and Radeon drivers are recommended for Ubuntu 16.04 LTS.

Opensource AMDGPU and Radeon drivers are recommended for Ubuntu 16.04 LTS.
Ubuntu 16.04 LTS does not support AMD catalyst drivers as AMD GPUs (graphics processing units). Instead, Canonical recommends that you use open-source Radeon and AMDGPU as alternatives.

The fglrx driver has abandoned Ubuntu 16.04 LTS and recommended Radeon and AMDGPU as alternatives. AMD has also invested a lot of work in driver for better user experience. If you are interested, you can read the related sections of the Ubuntu 16.04 LTS release notes.

If you install Ubuntu April 21, 2016 LTS after the official release on April 9, 16.04, you will not encounter the problem of the display driver. If you choose to upgrade from Ubuntu 15.10 or Ubuntu 14.04 LTS, The fglrx driver is automatically cleared from the xorg. conf configuration file during the upgrade process. After removing all AMD catalyst drivers, Ubuntu 16.04 LTS will automatically try to use either Radeon or AMDGPU as a suitable graphics driver.

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