Happened to me in 17.10. Like @fcole90 seemed to happen after unlocking
my session after unsuspending my machine in the morning. The unlocking
itself seemed to be stuck displaying some message about letting me
continue in a few moments, but it never did. I used ctrl-alt-f6 then
crtl-alt-f7 to 'wake it up', and that causes an unlock dialog to finally
appear.

Apologies for the vagueness of this!

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Packages, which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1543192

Title:
  Xorg crashed with SIGABRT in OsAbort() ["no screens found"]

Status in xorg-server package in Ubuntu:
  Confirmed

Bug description:
  https://errors.ubuntu.com/problem/4de849dfec89af168af9cda3318221a2a654e530

  ---

  No idea what happened.

  ProblemType: Crash
  DistroRelease: Ubuntu 16.04
  Package: xserver-xorg-core 2:1.17.3-2ubuntu2
  ProcVersionSignature: Ubuntu 4.4.0-2.16-generic 4.4.0
  Uname: Linux 4.4.0-2-generic x86_64
  .tmp.unity.support.test.0:

  ApportVersion: 2.19.4-0ubuntu2
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CrashCounter: 1
  Date: Mon Feb  8 17:07:23 2016
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroVariant: ubuntu
  ExecutablePath: /usr/lib/xorg/Xorg
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation 2nd Generation Core Processor Family Integrated Graphics 
Controller [8086:0126] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Lenovo 2nd Generation Core Processor Family Integrated Graphics 
Controller [17aa:21da]
  InstallationDate: Installed on 2015-04-30 (283 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: LENOVO 429149G
  ProcCmdline: /usr/lib/xorg/Xorg -core :0 -seat seat0 -auth 
/var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
  ProcEnviron:

  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-2-generic 
root=UUID=457973fc-512e-4b6a-b65b-85f15fa85b7b ro console=tty1 console=ttyS0 
panic=-1
  Signal: 6
  SourcePackage: xorg-server
  StacktraceTop:
   OsAbort ()
   ?? ()
   FatalError ()
   ?? ()
   __libc_start_main (main=0x557f8180ff00, argc=11, argv=0x7fffc9e34fd8, 
init=<optimised out>, fini=<optimised out>, rtld_fini=<optimised out>, 
stack_end=0x7fffc9e34fc8) at libc-start.c:289
  SystemImageInfo: Error: command ['system-image-cli', '-i'] failed with exit 
code 2:
  Title: Xorg crashed with SIGABRT in OsAbort()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

  dmi.bios.date: 05/18/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 8DET46WW (1.16 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 429149G
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: 
dmi:bvnLENOVO:bvr8DET46WW(1.16):bd05/18/2011:svnLENOVO:pn429149G:pvrThinkPadX220:rvnLENOVO:rn429149G:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 429149G
  dmi.product.version: ThinkPad X220
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.12.2+16.04.20151211-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.66-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.1.1-1ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.1.1-1ubuntu2
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.3-2ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.6.1-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160127-1ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1
  xserver.bootTime: Mon Feb  8 17:08:14 2016
  xserver.configfile: default
  xserver.errors: systemd-logind: failed to get session: PID 9847 does not 
belong to any known session
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                 728
   vendor                                     LGD
  xserver.version: 2:1.17.3-2ubuntu2

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