System doesn't boot (root device never becomes available after entering encryption passphrase) after today's Hirsute updates

[Jonathan Kamens]

Note: I'm guessing that lvm2 is the most likely culprit for this issue, but I don't know for certain.

After today's Hirsute upgrades, my system won't boot. The boot gets to the point where it asks me for the passphrase for my encrypted root disk, and I enter it, and then it says that it was unlocked successfully, and then it spins for a while, and then I get the message shown in the attached photo.

When I reboot with the older pre-Hirsute kernel (5.8.0-43-generic) I have installed the system boots successfully, but I don't think this is a kernel issue per se since I didn't upgrade the kernel today and my system has rebooted successfully before with the Hirsute kernel I currently have installed.

Note: the two kernel messages shown at the beginning of the photo are not relevant; they occur even when I fall back to the old kernel and boot successfully.

Attached: photo of console from failed boot, list of packages that were upgraded today.

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: lvm2 2.03.11-2ubuntu2
ProcVersionSignature: Ubuntu 5.8.0-43.49-generic 5.8.18
Uname: Linux 5.8.0-43-generic x86_64
NonfreeKernelModules: nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu59
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Tue Mar 2 14:22:26 2021
InstallationDate: Installed on 2019-01-02 (790 days ago)
InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3)
SourcePackage: lvm2
UpgradeStatus: Upgraded to hirsute on 2021-02-21 (9 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Christof Arnosti (charnocc)]

Bug is wrong rights on file /usr/share/initramfs-tools/hooks/lvm2, which is not executable.

To fix a non-booting system:
- Boot from live-linux
- Mount all file systems of installation to /mnt/ (this depends on your setup)
- chroot /mnt/
- chmod 766 /usr/share/initramfs-tools/hooks/lvm2
- update-initramfs -c -k all
- reboot