Thank you for using Ubuntu and reporting a bug.
Please note that 'sudo ufw disable' will flush the ufw chains and make
them all 'pass through' (ie, think of them as NOPs) until reboot. On
reboot, ufw won't run and even the pass through chains won't be added.
Furthermore, unless MANAGE_BUILTINS is set to 'yes' in /etc/default/ufw
(it defaults to 'no'), ufw only manages its own chains in an effort to
play nice with other software that adds rules to the firewall (eg,
libvirt). Looking at your bug description, there are no ufw rules on the
system, only rules in LIBVIRT_* chains, which ufw did not add when it
was enabled before it was disabled.
AFAICS, this is not a bug. ufw is behaving as expected and other
software on the system is responsible for adding the aforementioned
rules.
** Changed in: ufw (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1858464
Title:
iptable rules are still present after disabling ufw
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