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I recently installed the new Gnome 3.8 on my Ubuntu OS thinking it would only add the DE to my session manager at log in. I was wrong however. It actually changed the default to Gnome! I prefer Unity much more, but cannot change it back. How can I fix this?

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So what do you see in your session manager? Usually you can select the DE from a drop-down list. – Sparhawk Aug 11 '13 at 3:51
I see all the DE's in the session manager, but I can't figure out how to change the default DE so I can log in automatically. The display manager is the GDM Gmome style as well; I want the LightDM style, that I misatakenly didn't choose upon installation. – Ben Ayers Aug 11 '13 at 4:12
I use lightDM too, although I think it's a KDE variant. In my system, /etc/X11/default-display-manager contains /usr/sbin/lightdm. I guess you can try changing this first, then see if your selection of DE sticks. I used gdm once, and I seem to recall that it automatically made the last-selected DE as the default for next time, but I guess not. See if lightDM does this, though. – Sparhawk Aug 11 '13 at 4:38
Well, it's just me at the moment (not "you all"), but I'm not really sure how to help you with that problem, since I use KDE not Unity. I'd suggest creating a new question, and then trying this fix later when you have a chance. – Sparhawk Aug 11 '13 at 5:30

If the problem is the session manager, you can switch using the command:

sudo dpkg-reconfigure gdm

A dialogue will appear where you can chose between GDM and Lightdm.

The process is better explained here.

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