SocketPlugin: ignoring unknown option 'SO_REUSEPORT'

Hi there,

I am trying to get running croquet on my ubuntu dapper.
When I start from the console:
$ ./Croquet.sh
Everything starts fine, but as soon as i click on
Croquet(Master) or one of the other, I get the red sreen with 'waiting for connection'. But nothing else happens.  In the conosle I get the message:
SocketPlugin: ignoring unknown option 'SO_REUSEPORT'.

I have seen a similar thread in the forum but I cannot make sense of it. So would be nice to get some help.

Thanks for you help
martin