Cinnamon Desktop Is Available For Ubuntu 14.04 Trusty/12.04 Precise (PPA)

Cinnamon is a GTK+-based desktop environment. It originally started as a fork of the GNOME Shell, which is a user interface and was initially developed by (and for) Linux Mint. Cinnamon provides many features, including: Desktop effects, including animations and transition effects; A movable panel equipped with a main menu, launchers, a window list and the system tray; Various extensions; Applets that appear on the panel; Overview with functions similar to that in GNOME Shell; and Settings editor for easy customization. It can customize: The panel, The calendar, Themes, Desktop effects, Applets, Extensions.
Mint team released new version 2.x.x of Cinnamon with new features and bugs fixes, theme improvements, enhancements to the bottom panel, also include cinnamon setting manager. In version 2.x.x, and similar to MATE or Xfce, Cinnamon is an entire desktop environment built on GNOME technologies. It still uses toolkits and libraries such as GTK or Clutter and it is still compatible with all GNOME applications, but it no longer requires GNOME itself to be installed. It now communicates directly with its own backend services, libraries and daemons: cinnamon-desktop, cinnamon-session and cinnamon-settings-daemon.
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Warning: If you are using any other Mint application, remove that application and PPA from your system. If you added our Mint PPA first remove it with this command (sudo apt-get install ppa-purge && sudo ppa-purge ppa:noobslab/mint)

To install Cinnamon in Ubuntu 14.04 Trusty open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:

Terminal Commands:
sudo add-apt-repository ppa:gwendal-lebihan-dev/cinnamon-nightly
sudo apt-get update
sudo apt-get install cinnamon

To uninstall Cinnamon, enter these commands in Terminal:

Terminal Commands:
sudo apt-get install ppa-purge
sudo ppa-purge ppa:gwendal-lebihan-dev/cinnamon-nightly

To install Cinnamon in Ubuntu 12.04 Precise open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:

Terminal Commands:
sudo add-apt-repository ppa:tsvetko.tsvetkov/cinnamon
sudo apt-get update
sudo apt-get install cinnamon

To uninstall Cinnamon, enter these commands in Terminal:

Terminal Commands:
sudo apt-get install ppa-purge
sudo ppa-purge ppa:tsvetko.tsvetkov/cinnamon

That's it