Comment 0 for bug 1792932

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

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