** Description changed:

  * ubuntu when used as a guest inside a Virtualbox VM machine
  [Test Case]
  * Install Ubuntu and mate or other DM, experience a black screen
  * Install vbox on xenial with guest and host. Test if everything works
  and starts with 3d enabled and disabled, as well as different Desktop
+ [ autopkgtests ]
+ * this package has a really huge autopkgtest suite performed by upstream on 
each release, and this is the reason for me using the new release as-is instead 
of patching old versions.
  [Regression Potential]
  * This is part of virtualbox on Debian and Ubuntu since bionic and 3 months
  Author: Gianfranco Costamagna <costamagnagianfra...@yahoo.it>
  Date:   Tue Apr 24 00:15:39 2018 +0200
  basically, I now detect at runtime the --check3d switch, and enable the
  mesa override only for desktop and not for applications, the same as the
  official guest-additions packages do.
  this is the code:
  +       if /usr/bin/VBoxClient --check3d 2>/dev/null; then
  +               if test -e /usr/lib/virtualbox/additions/00vboxvideo.conf; 
  +                       cp -f /usr/lib/virtualbox/additions/00vboxvideo.conf 
  +                       ldconfig
  +               fi
  +       fi
  +       if test -e /etc/ld.so.conf.d/00vboxvideo.conf; then
  +               rm -f /etc/ld.so.conf.d/00vboxvideo.conf
  +               ldconfig
  +       fi
  the update-alternatives switch can't work when 3d is not enabled, and
  with user applications using mesa-specific features.
  [ upstream changes ]
  Version 5.1.38 (2018-05-09)
  Linux hosts: support Linux 4.17 changes.  Thank you Larry Finger
  Linux guests: support Linux 4.16 and EL 7.5 kernels (bugs #17676 and #17678)
  Linux guests: 3D fixes for recent guests (bug #17623)
  Version 5.1.36 (2018-04-17)
  VMM: Fixed missing NULL pointer check in MMIO code.
  Network: fixed VERR_INTNET_FLT_IF_NOT_FOUND when bridging to some adapters on 
Windows hosts (possibly related bugs #15294, #15060, #13481)
  [Other info]
  After performing an "apt-get update && apt-get upgrade" on a Ubuntu 16.04.4 
box, graphics fails to start. I use my laptop with text boot, then I log in and 
issue "startx", with "/usr/lib/gnome-flashback/gnome-flashback-metacity" in my 
~/.xinitrc file. After update, "startx" (Xorg) returns me to character prompt. 
Same with KDE, and while WMaker seemed to start, I still couldn't run apps like 
Firefox or Konsole. Tinkering with my system for about two hours I managed to 
figure out that this behaviour is caused by some Virtualbox package. After 
issuing "apt-get purge virtualbox*", the normal behaviour returned. Fortunately 
I don't use Virtualbox, it was installed 'just in case', so I could remove it 
without affecting everyday usage. But it seems that something in Virtualbox is 
seriously broken.
  A cut from apt's history.log after upgrade and before package removal:
  virtualbox:amd64 (5.0.40-dfsg-0ubuntu1.16.04.2, 5.1.34-dfsg-0ubuntu1.16.04.2)
  virtualbox-dkms:amd64 (5.0.40-dfsg-0ubuntu1.16.04.2, 
  virtualbox-guest-additions-iso:amd64 (5.0.40-0ubuntu1.16.04.1, 
  virtualbox-guest-dkms:amd64 (5.0.40-dfsg-0ubuntu1.16.04.2, 
  virtualbox-guest-utils:amd64 (5.0.40-dfsg-0ubuntu1.16.04.2, 
  virtualbox-guest-x11:amd64 (5.0.40-dfsg-0ubuntu1.16.04.2, 
  virtualbox-qt:amd64 (5.0.40-dfsg-0ubuntu1.16.04.2, 

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  [SRU] No graphics after update, caused by virtualbox

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