How to update kernel to the latest.

apt-cache search linux-image

sudo apt-get install linux-image-[version]

sudo apt-get install linux-headers-[version]-generic

sudo apt-get install linux-image-extra-[version]-generic   

OR:

1. Go here: http://kernel.ubuntu.com/~kernel-ppa/mainline/  
2. Download 3 (maybe 4) debs to a folder somewhere:
   
   

   linux-headers-VERSION-NUMBER_all.deb
   linux-headers-VERSION-NUMBER_amd64.deb
   linux-image-VERSION-NUMBER_amd64.deb
   linux-image-extra-VERSION-NUMBER_amd64.deb   # if available

3. Install the debs with whatever package manager front-end you use (is gdebi still around?), or use these commands:
   
   

   cd /path/to/folder/where/you/put/the/debs
   sudo dpkg -i *.deb