These issues are specific to iPrint on Linux.
Printer assignment fails for Linux drivers
Uploading a driver to the driver store succeeds but assigning the driver to the printer fails from iManager.
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.
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.