In Linux, all drivers are inside the kernel, so to get new drivers you just download the latest Linux kernel. You can find Ubuntu kernels here: http://kernel.ubuntu.com/~kernel-ppa/mainline/
I highly recommend the latest kernel 3.12-rc7. To install the kernel, you simply download the three debs for your system. If you have a 64-bit system then that would mean downloading *_all.deb and *_amd64.deb and installing them.
For 64-bit 3.12-rc7
cd ~/tmp
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.12-rc7-saucy/linux-headers-3.12.0-031200rc7-generic_3.12.0-031200rc7.201310271935_amd64.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.12-rc7-saucy/linux-headers-3.12.0-031200rc7_3.12.0-031200rc7.201310271935_all.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.12-rc7-saucy/linux-image-3.12.0-031200rc7-generic_3.12.0-031200rc7.201310271935_amd64.deb
sudo dpkg -i *.deb
For 32-bit 3.12-rc7
cd ~/tmp
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.12-rc7-saucy/linux-headers-3.12.0-031200rc7-generic_3.12.0-031200rc7.201310271935_i386.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.12-rc7-saucy/linux-headers-3.12.0-031200rc7_3.12.0-031200rc7.201310271935_all.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.12-rc7-saucy/linux-image-3.12.0-031200rc7-generic_3.12.0-031200rc7.201310271935_i386.deb
sudo dpkg -i *.deb