This issue is caused be a regression in iptables 1.8.1: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=912610
This is now addressed in iptables. Please upgrade to iptables 1.8.2-2 and ufw should start work again. If not, please file a new bug. Thanks! -- Jamie Strandboge | http://www.canonical.com
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