*** This bug is a duplicate of bug 1706713 ***
    https://bugs.launchpad.net/bugs/1706713

Public bug reported:

Each time my screen locks (via timeout or manually locking the screen),
I cannot unlock the screen because there is no Login-Prompt.

When the login prompt is missing, I can see the mouse-cursor, but
nothing else except a black background.

I've been having to hit CTRL-ALT-F2 to login via command line to reboot
before getting back to my desktop.

Someone else reported that rolling back to a previous kernel is a work-around:
https://askubuntu.com/questions/939707/

Hopefully, this can be fixed quickly enough to avoid such work-arounds?

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: unity 7.4.0+16.04.20160906-0ubuntu1
ProcVersionSignature: Ubuntu 4.10.0-27.30~16.04.2-generic 4.10.17
Uname: Linux 4.10.0-27-generic x86_64
.tmp.unity_support_test.0:
 
ApportVersion: 2.20.1-0ubuntu2.10
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
CurrentDesktop: Unity
Date: Wed Jul 26 15:04:59 2017
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
DkmsStatus: virtualbox, 5.0.40, 4.10.0-27-generic, x86_64: installed
GraphicsCard:
 NVIDIA Corporation GT216M [GeForce GT 230M] [10de:0a28] (rev a2) (prog-if 00 
[VGA controller])
   Subsystem: Hewlett-Packard Company GT216M [GeForce GT 230M] [103c:7001]
InstallationDate: Installed on 2017-07-24 (2 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 
(20170215.2)
MachineType: Hewlett-Packard HP Pavilion dv8 Notebook PC
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-27-generic 
root=UUID=6195f2d5-822c-4727-b73d-98531366a71c ro quiet splash vt.handoff=7
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/31/2010
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: F.25
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 7001
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 35.35
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: N/A
dmi.modalias: 
dmi:bvnHewlett-Packard:bvrF.25:bd05/31/2010:svnHewlett-Packard:pnHPPaviliondv8NotebookPC:pvr0499220000241210001040000:rvnHewlett-Packard:rn7001:rvr35.35:cvnHewlett-Packard:ct10:cvrN/A:
dmi.product.name: HP Pavilion dv8 Notebook PC
dmi.product.version: 0499220000241210001040000
dmi.sys.vendor: Hewlett-Packard
upstart.unity7.log: PluginRegistry::load_plugins: Importing plugin __init__.py 
failed: 'module' object has no attribute 'AVAILABLE'
version.compiz: compiz 1:0.9.12.2+16.04.20160823-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.70-1~ubuntu16.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 12.0.6-0ubuntu0.16.04.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 12.0.6-0ubuntu0.16.04.1
version.xserver-xorg-core: xserver-xorg-core N/A
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
xserver.bootTime: Wed Jul 26 14:56:05 2017
xserver.configfile: default
xserver.errors:
 Failed to load module "nvidia" (module does not exist, 0)
 Failed to load module "nvidia" (module does not exist, 0)
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.18.4-1ubuntu6.1~16.04.2
xserver.video_driver: nouveau

** Affects: unity (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug compiz-0.9 ubuntu xenial

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https://bugs.launchpad.net/bugs/1706764

Title:
  No Login Prompt After Screen-Lock Timeout

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