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First, I would like to know if I can install the Cinnamon DE without messing up Ubuntu GNOME.

Second, I would like to know how to install the Cinnamon DE.

Lastly, I would like to know how I would access Cinnamon after installing.

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  1. To Install, use:

    sudo add-apt-repository ppa:embrosyn/cinnamon
    sudo apt update
    sudo apt install cinnamon blueberry
    
  2. Steps to remove Cinnamon from the system:

    • Completely remove Cinnamon 3.0

      sudo rm /etc/apt/sources.list.d/embrosyn-cinnamon*.list
      sudo apt purge cinnamon* libcinnamon* nemo* libnemo-extension1 cjs libcjs0e blueberry gir1.2-cinnamondesktop-3.0 gir1.2-meta-muffin-0.0 libmuffin0 muffin-common
      sudo apt autoremove
      
    • Purge the PPA

      sudo apt install ppa-purge
      sudo ppa-purge ppa:embrosyn/cinnamon
      

Known issues:

In Ubuntu 16.04, Ambiance and Radiance themes have some issues in Cinnamon, like missing shadows for CSD apps.

  • Fix:

    sudo apt install numix-gtk-theme
    

After installtion logout and choose cinnamon desktop from login screen.

Source:

http://www.webupd8.org/2016/04/how-to-install-cinnamon-30-in-ubuntu.html

https://launchpad.net/~embrosyn/+archive/ubuntu/cinnamon

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