linux lpq printer not ready

Reference:
http://linux.dsplabs.com.au/cups-fixing-cups-printer-problem-usr-lib-cups-backend-lpd-failed-p16/
http://cityblogger.com/archives/2011/05/26/solution-for-cups-printer-not-ready

Status:
lpq: [printer] is not ready.

Solution:
1. edit /etc/cups/printers.conf and find these lines.
State Stopped
StateMessage /usr/lib/cups/backend/lpd failed

2. replace with this line.
State Idle

3. restart print service: service cups restart