Thanks for taking the time to report this bug and helping to make Ubuntu
better. We appreciate the difficulties you are facing, but this appears
to be a "regular" (non-security) bug.  I have unmarked it as a security
issue since this bug does not show evidence of allowing attackers to
cross privilege boundaries nor directly cause loss of data/privacy.
Please feel free to report any other bugs you may find.

** Information type changed from Private Security to Public

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https://bugs.launchpad.net/bugs/1746342

Title:
  Boot hangs on passphrase prompt for encrypted root file system with
  NVidia proprietary driver

Status in xorg package in Ubuntu:
  New

Bug description:
  During installation of Ubuntu 17.10.1, I checked the box for installing 
proprietary drivers,
  but on the initial (successful) boot after installation it came up running 
the Nouveau driver,
  and then I was prompted to select the proprietary drivers I wanted: NVidia & 
AMD64 Microcode.
  I selected both.

  Rebooting to the default Ubuntu grub entry fails at the passphrase prompt for 
the root file system.
  There is a graphic prompt for the passphrase, but there appears to be no 
response to key strokes.
  But passphrase actually appears in clear text on virtual terminal 7 when 
switched to.
  Unsuspecting users may enter their passphrase and walk away with their 
computer on (e.g. to get help) and anyone else with physical access potentially 
could discover their passphrase in the meantime.

  This happened with the initial nvidia driver: nvidia-384:amd64 
384.111-0ubuntu0.17.10.1
  But continues to happen after upgrading to: nvidia-390:amd64 390.12-0ubuntu1
  Likewise it occurs with both kernels 4.13.0-21 & 4.13.0-31

  The following work around the bug:
  1. Boot in recovery mode.  Then select "Resume normal boot" twice.
     (Alternatively, open recovery shell and exit it to resume booting.)
  2. But I preferred to modify /etc/default/grub as follows:
  Replacing:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
  with
    GRUB_CMDLINE_LINUX_DEFAULT=""
  and adding:
    GRUB_TERMINAL=console
    GRUB_GFXPAYLOAD_LINUX=text

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: xorg 1:7.7+19ubuntu3
  ProcVersionSignature: Ubuntu 4.13.0-31.34-generic 4.13.13
  Uname: Linux 4.13.0-31-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  .proc.driver.nvidia.gpus.0000.0e.00.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0000:0e:00.0'
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  390.12  Wed Dec 20 07:19:16 
PST 2017
   GCC version:  gcc version 7.2.0 (Ubuntu 7.2.0-8ubuntu3)
  ApportVersion: 2.20.7-0ubuntu3.7
  Architecture: amd64
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Jan 30 13:18:33 2018
  DistUpgraded: Fresh install
  DistroCodename: artful
  DistroVariant: ubuntu
  DkmsStatus:
   bbswitch, 0.8, 4.13.0-21-generic, x86_64: installed
   bbswitch, 0.8, 4.13.0-31-generic, x86_64: installed
   nvidia-390, 390.12, 4.13.0-31-generic, x86_64: installed
  ExtraDebuggingInterest: Yes, including running git bisection searches
  GpuHangFrequency: Continuously
  GpuHangReproducibility: Yes, I can easily reproduce it
  GpuHangStarted: Immediately after installing this version of Ubuntu
  GraphicsCard:
   NVIDIA Corporation GP106 [GeForce GTX 1060 6GB] [10de:1c03] (rev a1) 
(prog-if 00 [VGA controller])
     Subsystem: Micro-Star International Co., Ltd. [MSI] GP106 [GeForce GTX 
1060 6GB] [1462:3281]
  InstallationDate: Installed on 2018-01-22 (8 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.1)
  MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
  ProcEnviron:
   TERM=dumb
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.13.0-31-generic 
root=UUID=10f30b03-9566-4d46-997f-c80b29dd3589 ro rootflags=subvol=@
  SourcePackage: xorg
  Symptom: display
  Title: Xorg freeze
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/08/2017
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P3.20
  dmi.board.name: X370 Taichi
  dmi.board.vendor: ASRock
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP3.20:bd09/08/2017:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnX370Taichi:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.family: To Be Filled By O.E.M.
  dmi.product.name: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: To Be Filled By O.E.M.
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.83-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 17.2.4-0ubuntu1~17.10.2
  version.libgl1-mesa-glx: libgl1-mesa-glx 17.2.4-0ubuntu1~17.10.2
  version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.19.5-0ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.10.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20170309-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2

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