Comment 4 for bug 1539689

I think mine is the same. Problem with LVM2. Information as follows:

Setting up lvm2 (2.03.07-1ubuntu1) ...
update-initramfs: deferring update (trigger activated)
Failed to restart lvm2-lvmpolld.service: Unit lvm2-lvmpolld.socket is masked.
invoke-rc.d: initscript lvm2-lvmpolld, action "restart" failed.
● lvm2-lvmpolld.service - LVM2 poll daemon
     Loaded: loaded (/lib/systemd/system/lvm2-lvmpolld.service; static; vendor p
reset: enabled)
     Active: inactive (dead)
       Docs: man:lvmpolld(8)
dpkg: error processing package lvm2 (--configure):
 installed lvm2 package post-installation script subprocess returned error exit
status 1
Processing triggers for initramfs-tools (0.136ubuntu6) ...
update-initramfs: Generating /boot/initrd.img-5.4.0-7629-generic
Errors were encountered while processing:
 lvm2
E: Sub-process /usr/bin/dpkg returned an error code (1)