Public bug reported:

When attempting to log in to a newly updated bionic beaver via the
display manager (I think this is the right term), I immediately see a
crash, a return to the user selection/login screen and a no-longer
functioning keyboard and mouse. This happens both with the proprietary
driver installed drivers and with the apt installed nvidia-driver-396.

some interesting tidbits from the syslog file are:

May  3 09:20:18 madbox /usr/lib/gdm3/gdm-x-session[2748]: (EE) NVIDIA(GPU-0): 
Failed to acquire modesetting permission.
May  3 09:20:18 madbox /usr/lib/gdm3/gdm-x-session[2748]: (EE) NVIDIA(0): 
Failing initialization of X screen 0
May  3 09:20:18 madbox /usr/lib/gdm3/gdm-x-session[2748]: (II) UnloadModule: 
"nvidia"
May  3 09:20:18 madbox /usr/lib/gdm3/gdm-x-session[2748]: (II) UnloadSubModule: 
"wfb"
May  3 09:20:18 madbox /usr/lib/gdm3/gdm-x-session[2748]: (II) UnloadSubModule: 
"fb"
May  3 09:20:18 madbox /usr/lib/gdm3/gdm-x-session[2748]: (EE) Screen(s) found, 
but none have a usable configuration.
May  3 09:20:18 madbox /usr/lib/gdm3/gdm-x-session[2748]: (EE)
May  3 09:20:18 madbox /usr/lib/gdm3/gdm-x-session[2748]: Fatal server error:
May  3 09:20:18 madbox /usr/lib/gdm3/gdm-x-session[2748]: (EE) no screens 
found(EE)

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xorg 1:7.7+19ubuntu7
ProcVersionSignature: Ubuntu 4.15.0-20.21-lowlatency 4.15.17
Uname: Linux 4.15.0-20-lowlatency x86_64
NonfreeKernelModules: nvidia_modeset nvidia
.proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0000:01:00.0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  396.24  Thu Apr 26 00:10:09 
PDT 2018
 GCC version:  gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
Date: Thu May  3 09:28:59 2018
DistUpgraded: 2018-05-02 07:25:10,524 DEBUG failed to SystemUnLock() (E:Not 
locked)
DistroCodename: bionic
DistroVariant: ubuntu
DkmsStatus: nvidia, 396.24, 4.15.0-20-lowlatency, x86_64: installed
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
 NVIDIA Corporation GK104 [GeForce GTX 770] [10de:1184] (rev a1) (prog-if 00 
[VGA controller])
   Subsystem: eVga.com. Corp. GK104 [GeForce GTX 770] [3842:2774]
MachineType: ASUS All Series
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-20-lowlatency 
root=UUID=f308f075-bd97-4230-9d24-3ab727b0036b ro splash quiet nomodeset 
vt.handoff=1
SourcePackage: xorg
Symptom: display
Title: Xorg crash
UpgradeStatus: Upgraded to bionic on 2018-05-02 (1 days ago)
dmi.bios.date: 08/15/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1603
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: MAXIMUS VI GENE
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr1603:bd08/15/2014:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnMAXIMUSVIGENE:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.family: ASUS MB
dmi.product.name: All Series
dmi.product.version: System Version
dmi.sys.vendor: ASUS
version.compiz: compiz 1:0.9.13.1+18.04.20180302-0ubuntu1
version.libdrm2: libdrm2 2.4.91-2
version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.0~rc5-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.0~rc5-1ubuntu1
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.5-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20171229-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2
xserver.bootTime: Thu May  3 09:20:03 2018
xserver.configfile: /etc/X11/xorg.conf
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 
xserver.version: 2:1.19.6-1ubuntu4

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: amd64 apport-bug bionic crash possible-manual-nvidia-install 
third-party-packages ubuntu

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  Xorg crash

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