SOLVED: Must change the line started by "actionstart =" in the file iptables- ipset-proto6-allports.conf (or iptables-ipset-proto6-allports.local),
from (Fail2Ban v.0.10..x): actionstart = ipset create <ipmset> hash:ip timeout <bantime><familyopt> to (Fail2Ban v.0.11..x): actionstart = ipset create <ipmset> hash:ip timeout <default-timeout><familyopt> MA -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1875169 Title: After upgrading to Ubuntu 20.04 (from 18.04) Fail2Ban no longer inserts iptables --match-set rules To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/fail2ban/+bug/1875169/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
