On HP printers, PostScript files do not print in duplex mode, but PDF files print properly

Solution Verified - Updated 2024-08-06T05:45:00+00:00 -

Issue

Unable to print duplex with postscript but can successfully print PDFs in duplex. Using the lpr command and a Hewlett-Packard 9050 printer.
CUPS is not printing on both sides of the page.
To print both sides following options were enabled:
```
lpoptions -d printer1 -o sides=two-sided-long-edge
lpoptions -d printer3 -o sides=two-sided-long-edge
```
However this option is not working. Any suggestions on how can we can make this work?

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