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[Marco Trevisan (Treviño) <mail@xxxxxxxxx>]

I've playing with this a bit more to get the fix for the currently
affected users who already upgraded to bionic and removed nux-tools, but
I don't think there's a solution which works if we keep this marked as a
Conffile by dpkg.

In fact, using the various rm_conffile or just removing the file from a
maintainer script in any other package, then if the user will try to
reinstall unity (and then nux-tools), this config file won't be
reinstalled, as it's still there according to dpkg.

If anyone know a solution in how we can manipulate the dpkg status from
a maintainer script, that's the way, otherwise I've no other idea than
going back to the solution I proposed in the last night's MPs of
removing this conffile from nux-tools itself, storing it in /usr and
then symlinking it (with new name) to /etc [1] as mentioned (although
for other scenarios) in maintainers guide. So at that point any
reinstall will just work, and no purge will affect it.

PS: other *ugly* option would be instead to make this other-package
(mesa?) to replace in a maintainer script the content of this file with
the fixed one, but really I don't want to go in that way.

[1] https://bazaar.launchpad.net/~3v1n0/nux/x11-conffile-on-unity-
only/revision/893

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https://bugs.launchpad.net/bugs/1768610

Title:
  leftover conffile forces GNOME is software rendering

Status in mesa package in Ubuntu:
  New
Status in nux package in Ubuntu:
  Fix Released
Status in mesa source package in Xenial:
  New
Status in nux source package in Xenial:
  Fix Committed
Status in mesa source package in Artful:
  New
Status in nux source package in Artful:
  Fix Committed
Status in mesa source package in Bionic:
  New
Status in nux source package in Bionic:
  Fix Committed

Bug description:
  [ Impact ]

  GNOME shell and other 3D programs run using software rendering after
  unity removal.

  This SRU covers only the upgrade case or if nux-tools removal happens
  after this update, for people who already upgraded and in broken state
  another SRU will follow.

  [ Test case ]

  · Install xenial
  · Upgrade to bionic or artful
    (assuming you're using a GNOME session)
  · sudo apt remove nux-tools
  · log into your session
  . From terminal:
    - printenv LIBGL_ALWAYS_SOFTWARE
    Should print nothing (and return an error)

  Same should happen if you don't remove nux-tools but you change
  `/usr/lib/nux/unity_support_test` not to run properly (replace with a script exiting 1), but you're running a GNOME session.

  · If running Unity session instead, ensure that
    printenv LIBGL_ALWAYS_SOFTWARE equals 1 in case that you're running
    in an environment with no 3d support (VMs are easy tests)

  [ Regression Potential ]

  Unity desktops with no 3d support could not start anymore.

  ===========================

  After an upgrade from 17.10 to 18.04, I noticed that all gnome windows
  animations were gone.  After some digging, it seems that gnome-session
  incorrectly assumes that my graphics has no acceleration, when in fact
  it does: it's a i5-2520M CPU @ 2.50GHz with Intel integrated graphics
  (i915 driver).

  I've tried this with and without the xserver-xorg-video-intel package
  (a.k.a. Intel driver) with the same behavior.

  The output of gnome-session-check-accelerated is: llvmpipe (LLVM 6.0,
  256 bits)  however the system should have DRM 2.0 capability.

  GL checks (e.g. glxinfo, glxgears produce the expected output from a
  working DRM system).

  mesa-utils and mesa-utils-extra are both installed.

  I can't find a work around.  Perhaps there is something wrong with my
  install/upgrade?

  Everything else works fine, although the graphical transitions are no
  longer smooth.  But it would be nice to restore the expected behavior.

  I have attached the log of 'journalctl -b0'

  ProblemType: BugDistroRelease: Ubuntu 18.04
  Package: gnome-session 3.28.1-0ubuntu2
  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: Wed May  2 13:06:00 2018
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2016-04-22 (739 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bashSourcePackage: gnome-session
  UpgradeStatus: Upgraded to bionic on 2018-04-27 (5 days ago)

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