These issues are specific to iPrint on Linux.
Printer assignment fails for Linux drivers
Explanation:
Uploading a driver to the driver store succeeds but assigning the driver to the printer fails from iManager.
Possible Cause:
Verify whether the driver name contains two continuous blank spaces. The following two printers have been found to cause problems:
NOTE:Note the two continuous blank spaces before the word postscript in the above two examples.
Action:
Do not use Firefox to upload the drivers with two continuous blank spaces from a Linux client. Instead, use Internet Explorer from any Windows client to upload and assign the drivers.