I have the same problem with a similar history.
Under 08.04, duplex printing worked fine to a Xerox 5500 and a Xerox
Phaser 8550DP.
After upgrading to 08.10, duplexing works on the 5500 but not the
8550DP, as tested by printing the same document through evince.
** Changed in: ubuntu
Status: New => Confirmed
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duplex printing through CUPS no longer works
https://bugs.launchpad.net/bugs/308817
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