Since you have not given wireless card name.
I am giving you example with Intel card
I will revise the answer once you give exact name. If you cannot find the name the safe trick can be used which i mentioned in additional shortcut below.
Making Intel Dual Band Wireless-AC 7260 work in Ubuntu or other Linux.
Before that some quick simple summary how it works.
The Linux drivers are part of the upstream Linux kernel. But some devices needs additional firmware to tell kernel what device is all about and how to operate it.
So we need to download the firmware from Intel website and place in
/lib/firmware of the system , simple
So head to
http://www.intel.com/support/wireless/wlan/sb/CS-034398.htm
Download the tar related to kernel you have and device you have
Extract it
Place it in /lib/firmware
Reboot your machine
Done!!
Additional notes.
All of these are also part of Linux community code
http://git.kernel.org/cgit/linux/kernel/git/firmware/linux-firmware.git/tree/
In Ubuntu, firmware comes from one of the following sources:
The linux-image package (which contains the Linux kernel and licensed firmware)
The linux-firmware package (which contains other licensed firmware)
The linux-firmware-nonfree package in multiverse (which contains firmware that are missing redistribution licenses)
A separate driver package
Elsewhere (driver CD, email attachment, website)
The ideal scenario would have been some one back porting the latest firmeware in linux-firmware for saucy. But this not been done so we can just manually
drop the file.
A additional shortcut you can follow is just download Trusty (14.04) deb file and install it. The trusty already has the firmware for it.
http://packages.ubuntu.com/trusty/all/linux-firmware/download
https://wiki.ubuntu.com/Kernel/Firmware
