Can you run "ls -l /usr/lib/cups/backend/lpd"? It most have the
following results:

[EMAIL PROTECTED]:~$ ls -l /usr/lib/cups/backend/lpd 
-rwx------ 2 root root 19220 2008-04-21 21:18 /usr/lib/cups/backend/lpd
[EMAIL PROTECTED]:~$

Important is that only the owner is allowed to execute it and that the
owner is root. Then CUPS knows that the backend must be run as root
(otherwise it runs the backends as the special user "lp"). The lpd
backend has to be run as root, as otherwise it cannot communicate
through the reserved LPD port 515.

Make also sure that there is no firewall blocking port 515 on your
system.

-- 
cups does not pring to lpd printer
https://bugs.launchpad.net/bugs/213081
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