Comment 8 for bug 1641236

This affects Ubuntu 18.04 LXD containers as well.
As per previous mentions for tcpdump:
a) using script does not change anything
b) connecting via ssh and not lxc exec has no effect
c) disabling apparmour for tcpdump does work:
i.e.

/bin/ln -s /etc/apparmor.d/usr.sbin.tcpdump /etc/apparmor.d/disable/
/sbin/apparmor_parser -R /etc/apparmor.d