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http://www.omgubuntu.co.uk/2014/11/install-cinnamon-2-4-ubuntu-14-04-lts
sudo add-apt-repository ppa:gwendal-lebihan-dev/cinnamon-nightly
sudo apt-get update && sudo apt-get install cinnamon
Upgrade to or Install Cinnamon 2.4 in Ubuntu
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原文地址：http://www.cnblogs.com/cutepig/p/4470068.html
