The fix works as expected in B/C:
#COSMIC
ubuntu@c-ufw:~$ dpkg -l | grep ufw
ii ufw 0.36-0ubuntu0.18.10.1 all
program for managing a Netfilter firewall
ubuntu@c-ufw:~$ sudo ufw status numbered
Status: active
To Action From
-- ------ ----
[ 1] 22/tcp ALLOW IN Anywhere
[ 2] Anywhere ALLOW IN 1.2.3.4
[ 3] 22/tcp (v6) ALLOW IN Anywhere (v6)
[ 4] Anywhere (v6) ALLOW IN 2001:db8::/32
ubuntu@c-ufw:~$ sudo ufw prepend deny from 6.7.8.9
Rule inserted
ubuntu@c-ufw:~$ sudo ufw prepend deny from 2a02:2210:12:a:b820:fff:fea2:25d1
Rule inserted (v6)
ubuntu@c-ufw:~$ sudo ufw status numbered
Status: active
To Action From
-- ------ ----
[ 1] Anywhere DENY IN 6.7.8.9
[ 2] 22/tcp ALLOW IN Anywhere
[ 3] Anywhere ALLOW IN 1.2.3.4
[ 4] Anywhere (v6) DENY IN 2a02:2210:12:a:b820:fff:fea2:25d1
[ 5] 22/tcp (v6) ALLOW IN Anywhere (v6)
[ 6] Anywhere (v6) ALLOW IN 2001:db8::/32
#BIONIC
ubuntu@b-ufw:~$ dpkg -l | grep ufw
ii ufw 0.36-0ubuntu0.18.04.1
all program for managing a Netfilter firewall
ubuntu@b-ufw:~$ sudo ufw status numbered
Status: active
To Action From
-- ------ ----
[ 1] 22/tcp ALLOW IN Anywhere
[ 2] Anywhere ALLOW IN 1.2.3.4
[ 3] 22/tcp (v6) ALLOW IN Anywhere (v6)
[ 4] Anywhere (v6) ALLOW IN 2001:db8::/32
ubuntu@b-ufw:~$ sudo ufw prepend allow from 2001:db8::/32
Skipping inserting existing rule (v6)
ubuntu@b-ufw:~$ sudo ufw status numbered
Status: active
To Action From
-- ------ ----
[ 1] 22/tcp ALLOW IN Anywhere
[ 2] Anywhere ALLOW IN 1.2.3.4
[ 3] 22/tcp (v6) ALLOW IN Anywhere (v6)
[ 4] Anywhere (v6) ALLOW IN 2001:db8::/32
ubuntu@b-ufw:~$ sudo ufw prepend deny from 6.7.8.9
Rule inserted
ubuntu@b-ufw:~$ sudo ufw prepend deny from 2a02:2210:12:a:b820:fff:fea2:25d1
Rule inserted (v6)
ubuntu@b-ufw:~$ sudo ufw status numbered
Status: active
To Action From
-- ------ ----
[ 1] Anywhere DENY IN 6.7.8.9
[ 2] 22/tcp ALLOW IN Anywhere
[ 3] Anywhere ALLOW IN 1.2.3.4
[ 4] Anywhere (v6) DENY IN 2a02:2210:12:a:b820:fff:fea2:25d1
[ 5] 22/tcp (v6) ALLOW IN Anywhere (v6)
[ 6] Anywhere (v6) ALLOW IN 2001:db8::/32
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https://bugs.launchpad.net/bugs/1368411
Title:
Cannot insert IPV6 rule before IPV4 rules
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