I'm seeing this on focal as well. Running vgchange when the initramfs crashes to shell no longer seems to work - it just hangs. I have to add break=mount to kernel command line and do it there. Now working on hacking something into /etc/initramfs-tools/scripts/local-top/ - @Gabriele, that should allow you to make your changes permanent.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1848180 Title: LVM initrd fails to activate btrfs multidevice root To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lvm2/+bug/1848180/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs