Looks like a problem with the hpcups driver: prnt/hpcups/Pcl3Gui.cpp 75:
Requested resolution not supported with requested
printmodeprnt/hpcups/HPCupsFilter.cpp 420: m_Job initialization failed
with error = 25
Can you try changing the driver to "hpijs" in System > Administration >
Printing (system-config-printer):
Right-click your printer > Properties > Make and Model > Change ...
Does it print grayscale now?
** Changed in: cups (Ubuntu)
Status: New => Incomplete
** Package changed: cups (Ubuntu) => hplip (Ubuntu)
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https://bugs.launchpad.net/bugs/786048
Title:
Cannot print using grayscale
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