How do I upgrade from 14.04 to 14.04.2? [duplicate]
Just install all the updates and you'll get it.
The "point releases" of Ubuntu LTS versions aren't something special, as standard releases are. The same repositories are used.
In other words, 14.04.2 = 14.04 + all current updates.
If you want to use the new 3.16 kernel coming with the hardware enablement stack, you should use these terminal commands:
sudo apt-get install --install-recommends linux-generic-lts-utopic xserver-xorg-lts-utopic libgl1-mesa-glx-lts-utopic libegl1-mesa-drivers-lts-utopic
Source: https://wiki.ubuntu.com/Kernel/LTSEnablementStack