Unable to upgrade Cinnamon with Linux Mint 13

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http://unix.stackexchange.com – I would like to upgrade to the latest version of Cinnamon. I'm running Linux Mint 13 in a virtual machine. Everywhere I look, I see the same instructions: > sudo add-apt-repository ppa:gwendal-lebihan-dev/cinnamon-stable > sudo apt-get update > sudo apt-get install cinnamon When I do that, apt-get install reports that "cinnamon is already the newest version". When I check the version with "cinnamon --version", it reports 1.4 and not version 1.6 (or later) like I expect. Is there something else I need to do? Thanks. P.S. I originally posted this question on AskUbuntu since Mint (HowTos)