Okay, seems we got this error after running iptables -L, not iptables- save. Because iptables-save do not use xtables lock. Sorry
** Changed in: iptables (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1493773 Title: ip[6]tables-save missing -w(--wait) option To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/iptables/+bug/1493773/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs