Cinnamon is a free desktop environment from Linux Mint.It looks like a traditional GNOME 2 desktop but it is based on the modern GNOME Shell.
To install Cinnamon desktop environment on ubuntu
1.Open Terminal.To open terminal click the Dash home from unity launcher.And type terminal in the search field. And click Terminal.
2.Type the below code in terminal and hit enter.
sudo add-apt-repository ppa:gwendal-lebihan-dev/cinnamon-stable
3.Type your ubuntu password if needed.
4.Then press enter to continue or ctrl-c to cancel adding the ppa.
5.Type below command and hit enter
sudo apt-get update
6.Then type below command and press enter
sudo apt-get install cinnamon
Type y and hit enter to confirm cinnamon installation.
After the successful installation, reboot your computer and when you are prompted with your login screen click on the little Ubuntu icon next to your login name and select Cinnamon.