Thank you for your error_log.

According to the error_log, Ghostscript or hpijs crashes with a
segmentation fault. I have copied the Ghostscript command line from your
error_log and run it with some arbitrary PDF files. On Jaunty I can
reproduce the segmentation fault and according to /var/log/syslog it is
a segmentation fault in hpijs. On Karmic Ghostscript completes its job,
but produces a lot of warnings:

prnt/hpijs/hpijs.cpp 389: unable to set key=Quality:SpeedMech, value=1

Shiyun, Dave, Aaron, can someone of you look into what fixed the
segmentation fault in hpijs (and perhaps provide a patch) and also have
a look at what causes the warning in Karmic's HPIJS?

Ghostscript in Jaunty is 8.64, in Karmic is 8.70.

HPLIP in Jaunty is 3.9.2, in Karmic is 3.9.8.


** Changed in: hplip (Ubuntu)
       Status: Incomplete => Invalid

** Changed in: hplip (Ubuntu)
       Status: Invalid => Confirmed

** Also affects: hplip
   Importance: Undecided
       Status: New

** Changed in: hplip
       Status: New => Confirmed

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Duplex printing doesn't work on HP Officejet Pro 8500
https://bugs.launchpad.net/bugs/428588
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