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skunkworks@skunkworks-PC:~$ sudo virsh net-start default
error: Failed to start network default
error: internal error: Failed to apply firewall rules /sbin/iptables --table nat --insert POSTROUTING --source 192.168.122.0/24 '!' --destination 192.168.122.0/24 --jump MASQUERADE: iptables v1.4.21: can't initialize iptables table `nat': Table does not exist (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.