[ubuntu] removing unity and gnome session managers

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http://ubuntuforums.org – Hi all! I'd like to remove unity, gnome and all that, and just keep xfce4 (already installed). Even better, it'd be wonderful to have my computer boot into a login shell and let me run startx if and when I want a graphical session. Now I tried with some things along the lines of "apt-get remove unity ubuntu-desktop gnome-session" but it turns out it's too naive a method. I didn't get the splash screen on boot but I still had to press CTRL-ALT-F1 to get to a login shell. Searched and googled here and there and couldn't find a definitive explanation. Thank you for your kin (Hardware)