Kernel stops boot with panic; message is "can't find init". A manual addition on the kernel boot parameter line via /etc/default/grub doesn't help. It looks like the kernel can't access the file system.
lsinitramfs /boot/initrd.img | grep btr shows btrfs module as part of the initrd.
kernel 5.10.0-13.14 didn't have this problem. System boots from it without issues.
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu57
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: erik 1566 F.... pulseaudio
/dev/snd/controlC1: erik 1566 F.... pulseaudio
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
DistroRelease: Ubuntu 21.04
InstallationDate: Installed on 2020-03-24 (322 days ago)
InstallationMedia: Kubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200324)
MachineType: Dell Inc. Latitude E6530
Package: linux (not installed)
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.10.0-13-generic root=UUID=3889732d-ec13-4b68-84f9-f1da4272ff0f ro rootflags=subvol=@ quiet splash
ProcVersionSignature: Ubuntu 5.10.0-13.14-generic 5.10.9
RelatedPackageVersions:
linux-restricted-modules-5.10.0-13-generic N/A
linux-backports-modules-5.10.0-13-generic N/A
linux-firmware 1.194
Tags: hirsute
Uname: Linux 5.10.0-13-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo video
_MarkForUpload: True
dmi.bios.date: 11/30/2018
dmi.bios.release: 4.6
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A22
dmi.board.name: 07Y85M
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA22:bd11/30/2018:br4.6:svnDellInc.:pnLatitudeE6530:pvr01:rvnDellInc.:rn07Y85M:rvrA00:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E6530
dmi.product.sku: Latitude E6530
dmi.product.version: 01
dmi.sys.vendor: Dell Inc.
This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:
apport-collect 1915179
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the Ubuntu Kernel Team.