The same issue with notebook Sony Vaio SVS151190X. It works with kernel
4.13 and doesn't work with kernel 4.15

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  Kernel 4.15.0 fails to boot with linux-modules-extra

Status in linux package in Ubuntu:
Status in linux source package in Bionic:

Bug description:
  I upgraded my laptop (Sony VAIO SVS1511C5E, Intel Core i7-3612QM,
  NVIDIA GK107M / GeForce GT 640M LE, original hard disk changed to a
  Crucial SSD) yesterday from Ubuntu 17.10. to Ubuntu 18.04. The upgrade
  process went smoothly without issues.

  After upgrade, I cannot boot the new kernel version 4.15.0-23 in
  normal mode. The boot process hangs immediately after displaying
  "Loading initial ramdisk". In case I choose "Recovery mode", the
  system does boot successfully with the same kernel. I also tried
  installing kernels 4.15.0-22 and 4.15.0-24, which both behave

  The problem seems to be related to the linux-modules-extra package. If
  the package is not installed, the system boots also in the normal
  mode. However, the display is not correctly recognized, it shows up as
  "Unknown display" with 1024x768 resolution. That also happens if I
  choose "Recovery mode" and "Resume boot".

  The previous kernel 4.13.0-46 (with linux-modules-extra installed) works 
without problems and the display is recognized correctly.
  ProblemType: Bug
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
   /dev/snd/controlC0:  arto       2916 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 18.04
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=2ef70a11-4a51-4152-a156-14c706505b71
  InstallationDate: Installed on 2017-10-18 (263 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170926)
  MachineType: Sony Corporation SVS1511C5E
  Package: linux (not installed)
  ProcFB: 0 EFI VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-23-generic 
root=UUID=791d0e17-7a4d-47c8-8f69-708bebb1e658 ro recovery nomodeset
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
   linux-restricted-modules-4.15.0-23-generic N/A
   linux-backports-modules-4.15.0-23-generic  N/A
   linux-firmware                             1.173.1
  Tags:  bionic
  Uname: Linux 4.15.0-23-generic x86_64
  UpgradeStatus: Upgraded to bionic on 2018-07-08 (0 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare scanner sudo
  _MarkForUpload: True 05/17/2012
  dmi.bios.vendor: Insyde Corp.
  dmi.bios.version: R0142C5
  dmi.board.asset.tag: N/A VAIO
  dmi.board.vendor: Sony Corporation
  dmi.board.version: N/A
  dmi.chassis.asset.tag: N/A
  dmi.chassis.type: 10
  dmi.chassis.vendor: Sony Corporation
  dmi.chassis.version: N/A
dmi:bvnInsydeCorp.:bvrR0142C5:bd05/17/2012:svnSonyCorporation:pnSVS1511C5E:pvrC60AVZAU:rvnSonyCorporation:rnVAIO:rvrN/A:cvnSonyCorporation:ct10:cvrN/A: VAIO SVS1511C5E
  dmi.product.version: C60AVZAU
  dmi.sys.vendor: Sony Corporation

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