Printing from HP-UX v11.11 via LPD Protocol (Port 515) to CUPs queue on Ubuntu Server 12.04 i386 does not work

Printing from HP-UX v11.11 via LPD Protocol (Port 515) to CUPs queue on
Ubuntu Server 12.04 i386 does not work

i was migrating my old document composition software from SLES9 to Ubuntu
Server 12.04 i386. Everything is working fine until i tried to print from
the ERP Environment (HP-UX v11.11) to my new printserver (Ubuntu). The
printing requests will not be transfered from the HP-UX printing spooler
queue to the new printserver anymore. I think it should be the missing lpd
socket (Port 515) that is not availaible on the new machine. I don't see
it listing on the port (netstat -lpn).
I searched on Google for any soulutions, but i can't find anything that
works.
Does anyone know what i have to do that i can use the lpd protocol like in
the old SLES9 distribution where it works fine at the moment?
I tried to install lpr but it doesn't open a listening Port on 515....
Thanks for your help : )
Best regards, Adam