If you "upgraded" without removing the proprietary driver (assuming you had fglrx installed) rather than doing a fresh installation, you may very well have problems related to that.
fglrx does not work with Xenial. It is not even included as an option. However, if it had been installed prior to your upgrade (rather than a fresh install), then the xorg.conf created by installing fglrx would likely have survived the upgrade process and would now be directing your OS to try to use a driver that is neither compatible with nor available for the OS.
How we go about solving this is somewhat predicated on knowing if you upgraded in place, whether fglrx was previously installed and whether you uninstalled it prior to upgrading.
[ubuntu] 16.04.1 would be better if the display worked
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