dpkg: error processing package netfilter-persistent (–configure):
installed netfilter-persistent package post-installation script subprocess returned error exit status 1
dpkg: dependency problems prevent configuration of iptables-persistent:
iptables-persistent depends on netfilter-persistent (= 1.0.4+nmu2ubuntu1.1); however:
Package netfilter-persistent is not configured yet.

dpkg: error processing package iptables-persistent (–configure):
dependency problems – leaving unconfigured
Processing triggers for systemd (237-3ubuntu10.57) …
No apport report written because the error message indicates its a followup error from a previous failure.
Processing triggers for man-db (2.8.3-2ubuntu0.1) …
Processing triggers for ureadahead (0.100.0-21) …
Errors were encountered while processing:
netfilter-persistent
iptables-persistent
Updating available updates count …
E: Sub-process /usr/bin/dpkg returned an error code (1)

apt-get remove –purge netfilter-persistent
apt install iptables-persistent