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Explicitly Enable “raw” Printing for
application/octet-stream
If you use the first option (drivers are installed on the client
side), there is one setting to take care of: CUPS needs to be told
that it should allow “raw” printing of deliberate (binary) file
formats. The CUPS files that need to be correctly set for raw mode
printers to work are:
-
/etc/cups/mime.types
-
/etc/cups/mime.convs
Both contain entries (at the end of the respective files) that must be uncommented to allow RAW mode
operation. In /etc/cups/mime.types, make sure this line is present:
application/octet-stream
In /etc/cups/mime.convs, have this line:
application/octet-stream application/vnd.cups-raw 0 -
If these two files are not set up correctly for raw Windows client
printing, you may encounter the dreaded Unable to
convert file 0 in your CUPS error_log file.
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