Printer Repair Questions? Ask IT Technicians for Answers ASAP
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The printer cannot duplex because the function is very specific, probably to the model you have... or else, the model you have a driver for is not a model that has duplex function at all. (I haven't looked up and verified this specifically. I mention it because it makes sense.)
Drivers for older Debian versions/builds may not be capable with version 8. Newer drivers will evidently be needed... unless the compiler or library or other file that is missing, can be imported workably into a Debian version that omits it.
(Or doubtfully it is left out of ver. 8, owing to a bug.)
That seems sensible in every respect. I approve it.