There are 4 different Linux Mint 17.x releases available:
All four of them share the same base and they’re all supported until 2019.
Each new release introduces noticeable innovations and improvements, updated software and desktop environments.
Upgrading from any of these releases to the latest one:
So if kernel 3.19 or the new Xorg/Mesa don’t agree with your hardware and you find yourself unable to install Linux Mint 17.3, just download 17.1 or 17.2 instead and upgrade from there. You’ll find yourself running 17.3 in no time, enjoying the latest features with the same hardware support as in the release you installed.
In previous releases, Linux Mint repositories had an APT priority of 700 (as opposed to 500 for Ubuntu, Debian and 3rd party repositories).
This was changed in Linux Mint 17.3:
This improves support for PPA archives and makes it easier to upgrade software provided by Linux Mint (LibreOffice, KDE, Xfce, Cinnamon… etc.) via 3rd party repositories.
If you’re upgrading from a previous release and you modified the default priorities, please revert your changes.
UEFI is fully supported.
Linux Mint is not certified by Microsoft (and should not need to be). If your computer is using “secureBoot”, turn it off.
Note: If you really need secureBoot, you will need to use rEFInd and sign the kernel with a MOK).