Mac OS X 10.5: "Missing usb class driver" appears when printing to Lexmark printer

Issue or symptom

The alert message "Missing usb class driver" may appear when trying to print to a Lexmark printer using a driver included with Mac OS X 10.5 Leopard.

Solution

1. Use the troubleshooting steps in this Lexmark support article to completely remove older drivers.
   
   Note: You must remove /Library/Printers/Lexmark and /System/Library/Extensions/LexmarkUSBMerge.kext.
   
   
   
2. Restart.
3. Reinstall the driver included with Leopard via Optional Installs on the Leopard Install DVD.

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