Public bug reported:

I upgaded to -44 from -43 and my UEFI system (Dell Optiplex 3020) wont boot - i 
see grub, it starts, then collapses
back to the initramfs prompt

I downgraded to -43 and it works again

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-44-generic (not installed)
ProcVersionSignature: Ubuntu 3.13.0-43.72-generic 3.13.11.11
Uname: Linux 3.13.0-43-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.6
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC2:  mbw        2829 F.... pulseaudio
 /dev/snd/controlC0:  mbw        2829 F.... pulseaudio
 /dev/snd/controlC1:  mbw        2829 F.... pulseaudio
CurrentDesktop: Unity
Date: Mon Jan 12 15:51:45 2015
HibernationDevice: RESUME=UUID=ad3d0446-a2b9-4af5-8e88-3cdf6e9fd23d
InstallationDate: Installed on 2015-01-07 (5 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
IwConfig:
 eth0      no wireless extensions.
 
 lo        no wireless extensions.
MachineType: Dell Inc. OptiPlex 3020
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-43-generic.efi.signed 
root=/dev/mapper/ubuntu--vg-root ro quiet splash
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: Daemon not 
responding.
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-43-generic N/A
 linux-backports-modules-3.13.0-43-generic  N/A
 linux-firmware                             1.127.11
RfKill:
 
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/14/2014
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A03
dmi.board.name: 04YP6J
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.type: 15
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvrA03:bd04/14/2014:svnDellInc.:pnOptiPlex3020:pvr01:rvnDellInc.:rn04YP6J:rvrA01:cvnDellInc.:ct15:cvr:
dmi.product.name: OptiPlex 3020
dmi.product.version: 01
dmi.sys.vendor: Dell Inc.

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


** Tags: amd64 apport-bug trusty

** Summary changed:

- after upgrade, UEFI system will not boot
+ after upgrade from 3.13.0-43 to -44, UEFI system will not boot past grub

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https://bugs.launchpad.net/bugs/1409959

Title:
  after upgrade from 3.13.0-43 to -44, UEFI system will not boot past
  grub

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