As others have suggested, please take out the unnecssary CGI stuff. I looked at Device-ParallelPort-1.00 . It says (Driver) "Modules are available for linux (both directly and via parport), win32 and a simple script version.". It does not say anything about Ubuntu.

I don't know how different Ubuntu and Linux are. This is low level device driver stuff and the "flavor" of Unix can make a considerable difference. What happened when you installed the Linux driver on Ubuntu? Device::ParallelPort::drv::linux or Device::ParallelPort::drv::parport ? I don't know for sure, but suspect that there was some problem with that.

Device::ParallelPort is a front end to the appropriate driver (the ...drv::xxxx module) and won't work without a driver. There are a couple of "dummy drivers", drv::dummy_byte and drv::dummy_bit. Did you make any tests with one of those?

I tried to figure out what "parport" is but didn't find much in a quick look. Sounds like it is something different than a regular device driver. I'd be curious to the C code/driver that you used, there may be a useful clue there. You can put it inbetween <readmore></readmore> tags so it doesn't clutter up things.