Ubuntu 15.04
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GNOME Desktop Environment
Change Unity Desktop by default to GNOME Desktop Environment.
[1] Install GNOME Desktop Environment.
apt-get -y install gnome
# select Gdm or Lightdm you like during installation
[2] After rebooting, login screen is displayed, Select login user.
[3] Click the icon that is located near the "Sign In" button like follows, then it's possible to select Desktop Environments. For exmaple, this example selects "GNONE Flashback (Metacity)".
[4] It is just changed to GNOME Desktop Environment.
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