emacs-extras is a package (currently just for Ubuntu) that adds color themes and other convenient settings to a default emacs installation.

The following color themes are currently included:

• dracula
• solarized

Other settings addded by emacs-extras include:

• Managing backup files in a central location (default behavior for emacs is to place backup files in the same directory as the original files).
• Disabling electric indent (I really wish that was off by default).

1. Install software-properties-common, which allows you to add the hosting ppa to your local repository lists:

    sudo apt install software-properties-common
   

2. Add the hosting ppa:

    sudo add-apt-repository ppa:demonchild2112/emacs
   

3. Update apt sources:

   sudo apt update
   

4. Install:

   sudo apt install emacs-extras
   

5. Check that installation worked by running emacs-extras on a terminal without arguments - a usage message should be printed.