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[NoOp <1253155@xxxxxxxxxxxxxxxxxx>]

3.19.1 clears the issue for me:

~$ uname -a
Linux g 3.19.1-031901-generic #201503080052 SMP Sun Mar 8 00:54:35 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
$ dmesg | grep Magrathea
[    0.922583] Loaded X.509 cert 'Magrathea: Glacier signing key: f6e44eefe0b3323a7a9c2576cad3252ee3ee7cfc'

http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.19.1-vivid/

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https://bugs.launchpad.net/bugs/1253155

Title:
  Failure to validate module signature at boot time

Status in linux package in Ubuntu:
  Fix Released
Status in linux-lts-raring package in Ubuntu:
  Invalid
Status in linux source package in Precise:
  Invalid
Status in linux-lts-raring source package in Precise:
  Fix Released
Status in linux source package in Quantal:
  Invalid
Status in linux-lts-raring source package in Quantal:
  Invalid
Status in linux source package in Saucy:
  Fix Released
Status in linux-lts-raring source package in Saucy:
  Invalid
Status in linux source package in Trusty:
  Fix Released
Status in linux-lts-raring source package in Trusty:
  Invalid

Bug description:
  When booting under secureboot and using a signed kernel, it's expected
  that all modules shipped alongside the kernel should validate and load
  successfully without tainting the kernel.

  Unfortunately it doesn't seem to always be the case. Looking through
  my kernel logs, I see:

  Nov 15 10:35:24 castiana kernel: [    1.635132] video: module
  verification failed: signature and/or required key missing - tainting
  kernel

  or

  Nov 12 12:58:48 castiana kernel: [213981.753326] Request for unknown
  module key 'Magrathea: Glacier signing key:
  f440a253eb498df923d438caa09b3b5d99308405' err -11

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.12.0-2-generic 3.12.0-2.7
  ProcVersionSignature: Ubuntu 3.12.0-2.7-generic 3.12.0
  Uname: Linux 3.12.0-2-generic x86_64
  ApportVersion: 2.12.7-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  stgraber   2721 F.... pulseaudio
   /dev/snd/controlC0:  stgraber   2721 F.... pulseaudio
   /dev/snd/pcmC0D0c:   stgraber   2721 F...m pulseaudio
   /dev/snd/pcmC0D0p:   stgraber   2721 F...m pulseaudio
  CurrentDesktop: Unity
  Date: Wed Nov 20 11:59:57 2013
  InstallationDate: Installed on 2013-04-21 (213 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130420)
  MachineType: LENOVO 2306CT0
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.12.0-2-generic.efi.signed root=UUID=14de4e20-b139-488e-863f-ec710f776851 ro quiet splash "acpi_osi=!Windows 2012" vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.12.0-2-generic N/A
   linux-backports-modules-3.12.0-2-generic  N/A
   linux-firmware                            1.117
  SourcePackage: linux
  StagingDrivers: zram
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/27/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G2ET96WW (2.56 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 2306CT0
  dmi.board.vendor: LENOVO
  dmi.board.version: NO DPK
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrG2ET96WW(2.56):bd08/27/2013:svnLENOVO:pn2306CT0:pvrThinkPadX230:rvnLENOVO:rn2306CT0:rvrNODPK:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2306CT0
  dmi.product.version: ThinkPad X230
  dmi.sys.vendor: LENOVO

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