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[Ben Ward <1767468@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 1768610 ***
    https://bugs.launchpad.net/bugs/1768610

I had these exact same symptoms today with my nVidia GTX 960 after doing
a platform upgrade from 17.10 to 18.04.

Issue was actually dead simple to fix, the upgrade to 18.04 removed some
PPAs (including the graphics drivers), so although the nVidia driver
package was present on the system it wasn't getting updates and the
system appears to have selected a software only driver to use instead.
All I did was uninstall nvidia-390 using apt, re-added the ppa, apt-get
updated, then reinstalled nvidia-390 again using apt. Fixed it fine for
me.


###
sudo apt-get autoremove nvidia-390
sudo add-apt-repository ppa:graphics-drivers/ppa
sudo apt-get update
sudo apt-get install nvidia-390
###

hope this is useful :)

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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.

  Apparently the problem is that nux-tools is not purged, leaving the
  above file (also see #1768610).

  > 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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