Public bug reported:

Disk is encrypted using full disk encryption.  I could enter my password
to decrypt the disk when booting in 4.4.0-47, but after upgrading to
4.4.0-51, I'm prompted for the password, but I can't type anything.

I think the last time this happened there was some change with the USB
HID modules or something (I'm using a USB keyboard).  Has there been any
changes to the USB modules or configuration between kernel 4.4.0-47 and
4.4.0-51?

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-51-generic 4.4.0-51.72
ProcVersionSignature: Ubuntu 4.4.0-47.68-generic 4.4.24
Uname: Linux 4.4.0-47-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC2:  chris      2447 F.... pulseaudio
 /dev/snd/controlC1:  chris      2447 F.... pulseaudio
 /dev/snd/controlC0:  chris      2447 F.... pulseaudio
CurrentDesktop: Unity
Date: Sat Dec  3 11:39:50 2016
HibernationDevice: RESUME=UUID=8a9bf6f5-bb32-459a-8f5b-fc7f95451c26
InstallationDate: Installed on 2014-07-04 (883 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
IwConfig:
 lo        no wireless extensions.
 
 eth0      no wireless extensions.
MachineType: System manufacturer System Product Name
ProcFB:
 
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-47-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet nosplash
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-47-generic N/A
 linux-backports-modules-4.4.0-47-generic  N/A
 linux-firmware                            1.157.5
RfKill:
 
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/20/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2001
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: SABERTOOTH P67
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.:bvr2001:bd09/20/2011:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnSABERTOOTHP67:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

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


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1647075

Title:
  Unable to enter password to decrypt filesystem on boot after upgrading
  kernel to 4.4.0-51

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