LVM2 hook not executable; causes update-initramfs to miss adding lvm2 binaries

[Paul Goins]

I did an upgrade from Groovy to Hirsute today, but the upgrade did not go well.

I run an encrypted LVM for my root Ubuntu partition. My grub did not get updated properly at upgrade time, but via a USB startup disk for Hirsute I was able to repair this myself. However, I spent hours trying to get grub to detect my LVs.

Ultimately, I found the problem: /usr/share/initramfs-tools/hooks/lvm2 in the lvm2_2.03.11-2ubuntu2_amd64.deb package lacks an executable flag. Running update-initramfs verbosely highlighted that the hook was not getting fired for this reason.

Upon adding the executable flag to the file, I was able to use a chroot to re-build the initramfs and get my system to boot.

[Paul Goins (vultaire)]

Also, for completeness:

1) The release of Ubuntu you are using, via 'lsb_release -rd' or System -> About Ubuntu
Hirsute

2) The version of the package you are using, via 'apt-cache policy pkgname' or by checking in Software Center
2.03.11-2ubuntu2

3) What you expected to happen
To be able to build a working initramfs to boot Ubuntu after upgrade.

4) What happened instead
initramfs was missing the lvm2 binary and did not pick up my LVs after I decrypted the partition which hosted them.

[Christof Arnosti (charnocc)]

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

[Launchpad Janitor (janitor)]

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