Printer: Cannon MF4320d. I gave the command "lpr NNInteraction_Poster.pdf", then typed "lpq" which shows

MF4320-4350_(UFRII_LT) is ready and printing Rank Owner Job File(s) Total Size active Ritika 636 NNInteraction_Poster.pdf 549888 bytes

After a while "lpq" command returns:

MF4320-4350_(UFRII_LT) is ready no entries

But no printout is there. Is the driver missing? But then MF4320-4350_(UFRII_LT) will not come. What might be the problem?