After a few weeks trying to sort it out with symantec we finaly got it.
Tha instructions in the manual are correct to install from the CD, the case is that the CD never works, so symantec recommends you download directly from the MAC server the file containing the agent, extract and from the folder it is extracted desktop/cdimage in my cade run the
sudo ./installrams
sudo is necessary as you need root access to install the agent. Even this way, just before the instalation begins I still get the ...too many arguments... error. But the installation goes on and is succesful.
Hope this helps, as there is no documentation at all on this matter and symantec does not have the appropriate people to support this case, probab ly because we were the only people in the planet who bought this product.
Good luck!