This problem sounds like it might be related to problems in the setup
but not the kernels themselves. Is /boot a separate filesystem (which
possibly is out of space)? Looking into /boot, are all initrd* and
vmlinux* files report a roughly similar size (du -h)? Unfortunately a
bit messy to read but looking at /boot/grub/grub.cfg, do the references
to the root disk (usually UUIDs) make sense?

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https://bugs.launchpad.net/bugs/1814830

Title:
  recent linux versions 44 and 45 do not start up

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Beginning of the start-up error messages:
  Kernel panic - not syncing VFS: Unable to mount root fs on unknown-block(0,0)

  I modified menu.lst to use version 43 (/boot/vmlinuz-4.15.0-43-generic) as 
its first choice, version 43 still works fine.
  Thanks for your help, --Jan Kok

  Description:  Ubuntu 18.04.1 LTS
  Release:      18.04

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-43-generic 4.15.0-43.46
  ProcVersionSignature: Ubuntu 4.15.0-43.46-generic 4.15.18
  Uname: Linux 4.15.0-43-generic i686
  ApportVersion: 2.20.9-0ubuntu7.5
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  jan        1335 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Feb  5 23:05:01 2019
  HibernationDevice: RESUME=UUID=5a7ff351-aa16-4ca3-afa5-53e73f6e3279
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: Dell Inc. Inspiron 530
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: root=UUID=a93c0ea6-df02-4670-83a1-94cbc22b6598 ro quiet 
splash
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-43-generic N/A
   linux-backports-modules-4.15.0-43-generic  N/A
   linux-firmware                             1.173.3
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: Upgraded to bionic on 2019-01-09 (27 days ago)
  WpaSupplicantLog:
   
  dmi.bios.date: 06/20/2008
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.0.15
  dmi.board.name: 0K216C
  dmi.board.vendor: Dell Inc.
  dmi.board.version: ���
  dmi.chassis.type: 3
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: OEM
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.0.15:bd06/20/2008:svnDellInc.:pnInspiron530:pvr:rvnDellInc.:rn0K216C:rvr:cvnDellInc.:ct3:cvrOEM:
  dmi.product.name: Inspiron 530
  dmi.sys.vendor: Dell Inc.

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