*** This bug is a duplicate of bug 1814555 ***

Bug fixed! I apt upgraded to linux-image-4.18.0-15-generic 4.18.0-15.16
as usual, and my system boots happily again.

Thank you ~smb for the quick followup.

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  kernel hangs on boot after "fb: switching to inteldrmfb from VESA VGA"

Status in linux package in Ubuntu:

Bug description:
  A few days ago, I let update-manager upgrade my kernel from 4.18.0-13
  to 4.18.0-14. Since then, my system is unable to boot. It freezes
  after printing

    fb: switching to inteldrmfb from VESA VGA

  but before it gets around to asking me the passphrase for my encrypted
  main partition. (At first I thought it was a problem with cryptsetup
  because it never got to that prompt, but now I'm pretty sure it's
  something to do with changing video mode.)

  However, if I use the grub menu to select the older 4.18.0-13, the
  system boots just fine. It looks very much like a bug introduced
  between 4.18.0-13 and 4.18.0-14.

  Additionally, if I boot 4.18.0-14 in maintenance mode, the kernel
  modesetting does not happen, and the system boots just fine. (Except
  for the 1980s-style low-res video, that is.) This seems like good
  evidence that it's a problem with setting the video mode.

  I'll test with some mainline builds, but I want to get this bug report opened 
before I start rebooting.
  ProblemType: Bug
  ApportVersion: 2.20.10-0ubuntu13.2
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  DistroRelease: Ubuntu 18.10
  HibernationDevice: RESUME=UUID=fb24f9f1-0e89-4ef6-a88a-fb9fc5d776c7
  InstallationDate: Installed on 2018-09-05 (155 days ago)
  InstallationMedia: Lubuntu 18.04 LTS "Bionic Beaver" - Release amd64 
   enp2s0    no wireless extensions.
   lo        no wireless extensions.
  MachineType: System manufacturer System Product Name
  Package: linux (not installed)
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.18.0-14-generic 
root=/dev/mapper/lubuntu--vg-root ro
  ProcVersionSignature: Ubuntu 4.18.0-14.15-generic 4.18.20
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No 
PulseAudio daemon running, or not running as session daemon.
   linux-restricted-modules-4.18.0-14-generic N/A
   linux-backports-modules-4.18.0-14-generic  N/A
   linux-firmware                             1.175.1
  Tags:  cosmic
  Uname: Linux 4.18.0-14-generic x86_64
  UpgradeStatus: Upgraded to cosmic on 2019-01-23 (16 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo wireshark
  _MarkForUpload: True
  dmi.bios.date: 07/22/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1604
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: P7H55-M PRO
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.product.family: To Be Filled By O.E.M.
  dmi.product.name: System Product Name
  dmi.product.sku: To Be Filled By O.E.M.
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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