Public bug reported:

When trying to boot into 3.19.0-25, the screen either remains purple or
displays the disk unlock dialog scaled by about a factor of two and in
an inoperable state. The only thing that works is Ctrl-Alt-Del and than
select 3.19.0-22 from the grub menu

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: linux-image-3.19.0-25-generic 3.19.0-25.26
ProcVersionSignature: Ubuntu 3.19.0-22.22-generic 3.19.8-ckt1
Uname: Linux 3.19.0-22-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.17.2-0ubuntu1.2
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  hars       1746 F.... pulseaudio
 /dev/snd/controlC0:  hars       1746 F.... pulseaudio
CurrentDesktop: Unity
Date: Sun Dec  3 11:49:01 2017
HibernationDevice: RESUME=UUID=df5b6f6f-fa69-4847-8cb2-ae04efb3a197
InstallationDate: Installed on 2015-07-17 (869 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
MachineType: LENOVO 20BC0006GE
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-22-generic.efi.signed 
root=/dev/mapper/ubuntu--vg-root ro quiet splash
RelatedPackageVersions:
 linux-restricted-modules-3.19.0-22-generic N/A
 linux-backports-modules-3.19.0-22-generic  N/A
 linux-firmware                             1.143.1
SourcePackage: linux
UdevLog: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/11/2013
dmi.bios.vendor: LENOVO
dmi.bios.version: HSET20WW (1.03 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20BC0006GE
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: 
dmi:bvnLENOVO:bvrHSET20WW(1.03):bd07/11/2013:svnLENOVO:pn20BC0006GE:pvrThinkPadEdgeE145:rvnLENOVO:rn20BC0006GE:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 20BC0006GE
dmi.product.version: ThinkPad Edge E145
dmi.sys.vendor: LENOVO

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


** Tags: amd64 apport-bug vivid

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https://bugs.launchpad.net/bugs/1735985

Title:
  Updating to linux-image-3.19.0-25 renders system unbootable

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