Setting up ufw (0.35-0ubuntu2) ...
insserv: warning: script 'wide-dhcpv6-client' missing LSB tags and overrides
insserv: warning: script 'bind9' missing LSB tags and overrides
insserv: There is a loop between service nginx and bind9 if stopped
insserv:  loop involving service bind9 at depth 2
insserv:  loop involving service nginx at depth 1
insserv:  loop involving service sendsigs at depth 4
insserv: exiting now without changing boot order!
update-rc.d: error: insserv rejected the script header
dpkg: error processing package ufw (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 ufw
E: Sub-process /usr/bin/dpkg returned an error code (1)