I also tried the packages from proposed on top of 18.04.0 on which I
could reproduce the original issue and the packages from proposed fixed
it. double verification done.

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https://bugs.launchpad.net/bugs/1792932

Title:
  Desktop fails to boot in vbox:  Xorg assert failure: Xorg:
  ../../../../dix/privates.c:384: dixRegisterPrivateKey: Assertion
  `!global_keys[type].created' failed.

Status in X.Org X server:
  New
Status in xorg-server package in Ubuntu:
  Fix Released
Status in xorg-server source package in Xenial:
  Confirmed
Status in xorg-server source package in Bionic:
  Fix Committed
Status in xorg-server source package in Cosmic:
  Fix Released

Bug description:
  https://errors.ubuntu.com/problem/4ffab1fb339140b2c39fa0d096293706399e7280
  https://errors.ubuntu.com/problem/d18c1a21ca8ed1bb6cca06ddb5350187bed44f80

  ---

  Test Case:
  Boot Ubuntu Cosmic Desktop 20180916 on Virtual Box

  Actual Result
  Black screen or dropped to the login screen if the user skips ubiquity-dm

  Workaround:
  Add nomodeset on the kernel command line or from the boot menu, press F6 then 
select nomodeset

  Possibly a duplicate of bug 1432137

  Fix:
  Backport a patch from 1.20.2

  Regression potential:
  None really, we've had this xserver version since 18.10 and in the HWE 
backport, this patch backport is for 18.04 stock xserver but should work the 
same. It just skips initializing glamor if the system is using software 
fallback.

  ProblemType: Crash
  DistroRelease: Ubuntu 18.10
  Package: xserver-xorg-core 2:1.20.1-1ubuntu2
  ProcVersionSignature: Ubuntu 4.18.0-7.8-generic 4.18.5
  Uname: Linux 4.18.0-7-generic x86_64
  ApportVersion: 2.20.10-0ubuntu9
  Architecture: amd64
  AssertionMessage: Xorg: ../../../../dix/privates.c:384: 
dixRegisterPrivateKey: Assertion `!global_keys[type].created' failed.
  CasperVersion: 1.395
  CompositorRunning: None
  Date: Mon Sep 17 12:42:24 2018
  DistUpgraded: Fresh install
  DistroCodename: cosmic
  DistroVariant: ubuntu
  ExecutablePath: /usr/lib/xorg/Xorg
  ExtraDebuggingInterest: Yes
  GraphicsCard: InnoTek Systemberatung GmbH VirtualBox Graphics Adapter 
[80ee:beef] (prog-if 00 [VGA controller])
  LiveMediaBuild: Ubuntu 18.10 "Cosmic Cuttlefish" - Alpha amd64 (20180916)
  Lsusb:
   Bus 001 Device 002: ID 80ee:0021 VirtualBox USB Tablet
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: innotek GmbH VirtualBox
  ProcCmdline: /usr/lib/xorg/Xorg vt1 -displayfd 3 -auth 
/run/user/999/gdm/Xauthority -background none -noreset -keeptty -verbose 3
  ProcEnviron:

  ProcKernelCmdLine: file=/cdrom/preseed/hostname.seed boot=casper 
initrd=/casper/initrd ---  keyboard-configuration/layoutcode=fr 
keyboard-configuration/variantcode=oss
  Signal: 6
  SourcePackage: xorg-server
  StacktraceTop:
   __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
   __GI_abort () at abort.c:79
   __assert_fail_base (fmt=0x7f60fa1e3858 "%s%s%s:%u: %s%sAssertion `%s' 
failed.\n%n", assertion=0x563dbf96db7d "!global_keys[type].created", 
file=0x563dbf96db38 "../../../../dix/privates.c", line=384, function=<optimized 
out>) at assert.c:92
   __GI___assert_fail (assertion=0x563dbf96db7d "!global_keys[type].created", 
file=0x563dbf96db38 "../../../../dix/privates.c", line=384, 
function=0x563dbf96dde0 "dixRegisterPrivateKey") at assert.c:101
   dixRegisterPrivateKey ()
  Title: Xorg assert failure: Xorg: ../../../../dix/privates.c:384: 
dixRegisterPrivateKey: Assertion `!global_keys[type].created' failed.
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 12/01/2006
  dmi.bios.vendor: innotek GmbH
  dmi.bios.version: VirtualBox
  dmi.board.name: VirtualBox
  dmi.board.vendor: Oracle Corporation
  dmi.board.version: 1.2
  dmi.chassis.type: 1
  dmi.chassis.vendor: Oracle Corporation
  dmi.modalias: 
dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr:
  dmi.product.family: Virtual Machine
  dmi.product.name: VirtualBox
  dmi.product.version: 1.2
  dmi.sys.vendor: innotek GmbH
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.94-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 18.1.5-1ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx 18.1.5-1ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.1-1ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1build1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20171229-1build1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-3

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