Hi Jedamdr,
I'm not very familiar with Linux operating systems. However, I've found a driver download page that might help you.
NI488.2 version 2.5. Supports Red hat Enterprise Linux WS 5
http://joule.ni.com/nidu/cds/view/p/id/799/lang/en
General Ni488.2 Driver support page
http://sine.ni.com/psp/app/doc/p/id/psp-356
I hope this helps.
Josh L.
Applications Engineer
National Instruments