Remove LXDM and start DE via startx/startlxde

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http://askubuntu.com – I want to remove lxdm and start lxde with just startx or startlxde. I previously just had an openbox installation and was building that up. I then installed lxde, but wanted to get rid of lxdm, so I uninstalled it. Upon doing so, typing startx or startlxde kicks me into the previous blackbox session and not into the lxde session. How do I fix this? (HowTos)