I ran across the same bug. It was caused by the root filesystem being specified on the kernel command line with the root=UUID=<foo> syntax. This is not handled by the case "$dev" in stanza in activate() in /usr/share/initramfs-tools/scripts/local-top/lvm2. See attached screenshot. If I change the kernel command line to say root=/dev/vg0/root instead it works.
** Attachment added: "Screenshot of initramfs lvm2 script failing on UUID root syntax" https://bugs.launchpad.net/ubuntu/+source/lvm2/+bug/1573982/+attachment/4870302/+files/Screenshot.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1573982 Title: LVM boot problem - volumes not activated after upgrade to Xenial To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lvm2/+bug/1573982/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
