Thank you for reporting this bug and helping make Ubuntu even better.
What version of Ubuntu are you using?
Can you check the md5sum of /etc/init.d/ufw with this command: $ md5sum /etc/init.d/ufw
It should return: 50305550d0921a5599238a8b22ba12a0 /etc/init.d/ufw
Can you check /etc/default/ufw and verify this line: IPV6=no
Thank you for reporting this bug and helping make Ubuntu even better.
What version of Ubuntu are you using?
Can you check the md5sum of /etc/init.d/ufw with this command:
$ md5sum /etc/init.d/ufw
It should return: 599238a8b22ba12 a0 /etc/init.d/ufw
50305550d0921a5
Can you check /etc/default/ufw and verify this line:
IPV6=no