Multigigabit b/g/n ?!!? What ARE you talking about. 802.11n has a theoretical limit of 0.6gbps, but no one will ever see that.
The drivers are mostly built into the kernel and there is USUALLY nothing to install.
What chipset is in your laptop ? Or use the
command then post the wireless driver section, for example
03:00.0 Network controller : Intel Corporation Centrino Ultimate-N 6300 [8086:4238] (rev 35)
Subsystem: Intel Corporation Centrino Ultimate-N 6300 3x3 AGN [8086:1111]
Kernel driver in use: iwlwifi
your several lines will be different of course.