[libvirt] iptables complains about a bad rule

With libvirt from git on Ubuntu 10.04 I get this 3 errors (actually 2 warnings an 1 error) when starting libvirtd: 23:15:45.221: error : virRunWithHook:855 : internal error '/sbin/iptables --table mangle --delete POSTROUTING --out-interface virbr0 --protocol udp --destination-port 68 --jump CHECKSUM --checksum-fill' exited with non-zero status 2 and signal 0: iptables v1.4.4: unknown option `--checksum-fill' Try `iptables -h' or 'iptables --help' for more information. 23:15:45.238: error : virRunWithHook:855 : internal error '/sbin/iptables --table filter --delete INPUT --in-interface virbr0 --protocol udp --destination-port 69 --jump ACCEPT' exited with non-zero status 1 and signal 0: iptables: Bad rule (does a matching rule exist in that chain?). 23:15:45.275: error : virRunWithHook:855 : internal error '/sbin/iptables --table mangle --insert POSTROUTING --out-interface virbr0 --protocol udp --destination-port 68 --jump CHECKSUM --checksum-fill' exited with non-zero status 2 and signal 0: iptables v1.4.4: unknown option `--checksum-fill' Try `iptables -h' or 'iptables --help' for more information. The first and the last one just indicate that my iptables here is too old to know about --checksum-fill, but what about the second one? Matthias