You don't have to do anything manually, you can upgrade your machine to a full 12.04.2 system by doing the following...
Code:
sudo apt-get install linux-generic-lts-quantal xserver-xorg-lts-quantal
Be aware that some graphics hardware won't work using the closed-source drivers with the new xorg subsystem (specifically ATI 2/3/4xxx series cards) so if you are unsure you may want to only install the kernel package (linux-generic-lts-quantal).
For more information see this page...
https://wiki.ubuntu.com/Kernel/LTSEnablementStack
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