VirtualBox

how to install virtualbox:

Add the following line to your /etc/apt/sources.list:
deb http://download.virtualbox.org/virtualbox/debian vivid contrib

According to your distribution, replace 'vivid' by 'utopic', 'trusty', 'raring', 'quantal', 'precise', 'lucid', 'jessie', 'wheezy', or 'squeeze'.

download and add The Oracle public key for apt-secure:
wget -q https://www.virtualbox.org/download/oracle_vbox.asc -O- | sudo apt-key add -

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gnome-desktop

how to reinstall gnome desktop environment if lost:

  • boot normally and then at login prompt
  • press Press Ctrl + Alt+F1 to get a text based login.
    note: you would need to (Press Ctrl + Alt+F7) to return to GUI mode
  • apt-get update
  • tasksel install gnome-desktop --new-install

Thats all folks: Gnome is installed.

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