3 newest kernel do not boot (black screen)

[Sdennler]

Hello,

I'm running Kbuntu 18.04.5 LTS and currently have the following kernels installed which all just show a black screen when booting (occasionally a single _ is displayed):

linux-image-4.15.0-132-generic
linux-image-4.15.0-130-generic
linux-image-4.15.0-129-generic

I had the issue first with the newer two kernels and the 129 did work. I uninstalled some older kernels to free space on /boot and reinstalled the newest kernel. I also installed some other, hopefully unrelated, packages around php + mariadb. Now 129 is also not working any more (same behavior).

The recovery modes do work.
linux-image-4.13.0-36-generic is working.

I do have a full disk encryption active.

I also wrote here and got the advice to report a bug:
https://answers.launchpad.net/ubuntu/+question/695293

Thank you in advance for any help!

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-132-generic 4.15.0-132.136
ProcVersionSignature: Ubuntu 4.13.0-36.40-generic 4.13.13
Uname: Linux 4.13.0-36-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.21
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: sdennler 2695 F.... pulseaudio
 /dev/snd/controlC0: sdennler 2695 F.... pulseaudio
CurrentDesktop: KDE
Date: Mon Feb 1 18:35:20 2021
HibernationDevice: RESUME=UUID=8e2585bb-f721-4eee-9030-5ef469cfdef0
InstallationDate: Installed on 2018-02-09 (1087 days ago)
InstallationMedia: Kubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.2)
MachineType: HP HP EliteBook 840 G3
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.13.0-36-generic root=/dev/mapper/vgkubuntu-root ro kopt=root=/dev/mapper/vgkubuntu-root
RelatedPackageVersions:
 linux-restricted-modules-4.13.0-36-generic N/A
 linux-backports-modules-4.13.0-36-generic N/A
 linux-firmware 1.173.19
SourcePackage: linux
UpgradeStatus: Upgraded to bionic on 2018-08-29 (887 days ago)
dmi.bios.date: 03/22/2016
dmi.bios.vendor: HP
dmi.bios.version: N75 Ver. 01.05
dmi.board.name: 8079
dmi.board.vendor: HP
dmi.board.version: KBC Version 85.61
dmi.chassis.asset.tag: 5CG6231YK9
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.modalias: dmi:bvnHP:bvrN75Ver.01.05:bd03/22/2016:svnHP:pnHPEliteBook840G3:pvr:rvnHP:rn8079:rvrKBCVersion85.61:cvnHP:ct10:cvr:
dmi.product.family: 103C_5336AN G=N L=BUS B=HP S=ELI
dmi.product.name: HP EliteBook 840 G3
dmi.sys.vendor: HP

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

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