How to Install Linux Kernel 3.9 in Ubuntu
The latest version of the Linux Kernel is 3.9, and features major improvements in power consumption, compatibility, stability and security. However, no version of Ubuntu currently uses it, despite many user reporting safe and stable systems, and development commencing on 3.10 (yes, we know, versions can be weird and unmathmatical).
This script will attempt to install Linux Kernel 3.9 on this machine. Typically, your current version will be kept, and you will be able to utilise it again later if Linux Kernel 3.9 does not work. However, it is possible, if unlikely, that this script will render your system inoperable on with certain software installed, or with certain hardware configurations. How to Ubuntu does not offer any guarantees whatsoever, but it worked for us. Use with care (especially around UEFI).