I reproduced the bug with the following:
* 17.10 itself upgraded from 17.04
* uninstalled Unity (to workaround a bug but I don't remember which one)
* upgrade to 18.04 today

-> hardware acceleration disabled

lspci:
> 00:02.0 VGA compatible controller: Intel Corporation Device 5a85 (rev 0b)

The workaround described in #6 worked like a charm for me.

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https://bugs.launchpad.net/bugs/1767468

Title:
  Upgrade from 16.04 to 18.04, then uninstalling unity disables hardware
  acceleration

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