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<pre class="message">Dear Maintainer,
We have the same problem, aand investigated a bit:
Running Firefox or Thunderbird as en_US.UTF-8 allows us to print double sideded, however, this changes the paper format to Letter.
Duplex printing fails with other locales, e.g. de_DE, fr_FR or en_GB.
Yours,
Dominik Mies
IT, Mathematical Institute of the University of Bonn
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