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 Linux mint
1.Open linux mint software manager. To open software manager in linux mint, click Menu button and select software manager or type software manager in the search field and click software manager.
2.Type Cinnamon in the software manager search field and select Cinnamon.
3.click the install button.
4.Type your linux mint password if needed.
5.After the successful installation close software manager.
6.Log out and select Cinnamon from the login screen and log back in.