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Put this in /etc/ufw/before.rules
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# allow outbound icmp -A ufw-before-output -p icmp -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT -A ufw-before-output -p icmp -m state --state ESTABLISHED,RELATED -j ACCEPT
URL: http://www.kelvinism.com/howtos/enable-icmp-through-ufw/