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Why Radeon Users May Want to Avoid Ubuntu 16.04 LTS
If you use the AMD Catalyst (fglrx) driver on Ubuntu you may wish to avoid upgrading to Ubuntu 16.04 LTS next month.
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Rough edges with the (newly recommended) open-source replacements could mean that some upgraders will encounter poorer performance under 16.04 than in Ubuntu 14.04 LTS or 15.10.
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The Ubuntu 16.04 upgrade process will remove both the fglrx driver and the Xorg.conf that supports it from Ubuntu.
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You can not re-install the fglrx/catalyst driver (or its display stack) from the Ubuntu 16.04 archives after the upgrade completes as the driver is, bluntly, no longer there.
Furthermore, you cannot download and install the fglrx/catalyst driver using binary packages from the AMD website as, even if you could get them to install, the driver does not support Xorg 1.18¹ that ships in Xenial.
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AMD has a new Catalyst driver due for release this summer, but even this effort, based on AMDGPU, is unlikely to support the same breadth of hardware that fglrx already does.
The full impact of this (understandable) decision is yet to be felt.