it's not complaining about /lib/iptables/libipt.multiport.so not being there, the error is coming from that libipt.multiport.so library and it probably can't find another library. so u need to find out what library file ur missing
it'll give u a list of every library that libipt.multiport.so needs and where it's located. libraries that are needed but not found are listed as well, but instead of giving the path to the lib it'll say something like "not found"
then u know what library u still need