Install Cinnamon

# add PPA
sudo add-apt-repository -y ppa:gwendal-lebihan-dev/cinnamon-stable
sudo apt-get update

# install cinnamon
sudo apt-get install -y cinnamon

# OPTIONAL: install nemo
sudo apt-get install -y nemo

# Links
http://wiki.ubuntuusers.de/Cinnamon
http://wiki.ubuntuusers.de/Paketquellen_freischalten/PPA#PPA-hinzufuegen