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[Thomas Mortagne <1767468@xxxxxxxxxxxxxxxxxx>]

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

Status in nux package in Ubuntu:
  Confirmed

Bug description:
  After upgrading from 16.04 to 18.04 on a very plain Intel Skylake
  graphics, hardware acceleration is gone. Glxinfo and System
  Information report 'llvmpipe' (software rasterizer)

  It is caused by the file
  /etc/X11/Xsession.d/50_check_unity_support
  which can be deleted and then this problem goes away.

  > 00:02.0 VGA compatible controller: Intel Corporation HD Graphics 520
  (rev 07)

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: libglvnd0 1.0.0-2ubuntu2
  ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
  Uname: Linux 4.15.0-20-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Apr 27 20:24:48 2018
  Dependencies:
   gcc-8-base 8-20180414-1ubuntu2
   libc6 2.27-3ubuntu1
   libgcc1 1:8-20180414-1ubuntu2
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2016-04-21 (735 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  SourcePackage: libglvnd
  UpgradeStatus: Upgraded to bionic on 2018-04-26 (0 days ago)

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