目前正在做Cups+hplip打印，移植完成之后，操作HP M104a打印机，
使用lp命令的时候报出 lp: Unsupported document-format "application/postscript".
查看/var/log/cups/error_log里面的内容
Send-Document client-error-document-format-not-supported: Unsupported document-format \"application/postscript\".
[Client 6] Returning IPP client-error-document-format-not-supported for Send-Document (ipp://localhost:631/printers/HP_M104a) from localhost
求指点！
