I was having problem with lvm package.
dpkg: error processing package lvm2 (--configure):
installed lvm2 package post-installation script subprocess returned error exit status 1
Processing triggers for initramfs-tools (0.130ubuntu3.5) ...
update-initramfs: Generating /boot/initrd.img-4.15.0-39-generic
Errors were encountered while processing:
lvm2
E: Sub-process /usr/bin/dpkg returned an error code (1)
ls -l /var/lib/dpkg/info | grep -i lvm
sudo mv /var/lib/dpkg/info/lvm* /tmp
This helped me resolve the dpkg error.