Linux Ubuntu Latest Cinnamon desktop Installation
How to Enable the Latest Cinnamon 3+ Apt PPA on Ubuntu 14.04-Trusty/14.10-Utopic/15.04-Vivid/15.10-Wily GNU+Linux desktop.
This Cinnamon Nightly Ubuntu Apt PPA is not stable and so it may manifest some sort of Misbehavior.
The Cinnamon desktop is an environment based on GTK+ 3. The project originally started as a fork of the GNOME Shell, i.e. a mere graphical shell. Cinnamon was initially developed by (and for) the Linux distribution Linux Mint.
 
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Open a Shell Terminal Emulator Session 
 Ctrl+Alt+t on desktop
 (Press “Enter” to Execute Commands)  In case first see: Terminal QuickStart Guide. 
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Adding Ubuntu Cinnamon Apt PPA. sudo apt-add-repository ppa:gwendal-lebihan-dev/cinnamon-nightly If Got “User is Not in Sudoers file” then see: How to Enable sudo sudo apt-get update 
