Linux Ubuntu Latest Cinnamon desktop Installation
The tutorial shows you step-by-step How to Get Installed the Latest Cinnamon 3+ desktop on Ubuntu 15.04 Vivid Vervet i386/amd64 GNU+Linux.
The Cinnamon Nightly Ubuntu Apt Repo PPA is not stable and so the desktop 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.
Cinnamon is a desktop environment which combines a traditional desktop layout with modern graphical effects.
Now with Cinnamon 2.0 it has become a Complete desktop Environment and not merely a frontend for GNOME like GNOME Shell and Unity.


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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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How to Enable the Latest Cinnamon Apt PPA for Ubuntu
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Installing the Cinnamon desktop for Ubuntu 14.04+.
sudo apt-get install cinnamon
If Got “User is Not in Sudoers file” then see: How to Enable sudo
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Then after Log-Out you’ll be able to Switch on Log-In Screen to Cinnamon.