Comment 3 for bug 47263

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Aaron Albright (albrigha-deactivatedaccount) wrote :

Check the settings on the CUPS queue for this printer,
could be set to Duplex there.
Is there a front panel on this printer? If so, that is another place
to check.

Either way it sounds like cups or the printer is overriding the lpr command. Also try setting cups to debug mode and looking at the cups log. Print and post the cups log.

http://hplip.sourceforge.net/troubleshooting/printing.html

look at issue 2 for how to set the cups log to debug.

Aaron