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I recently installed xubuntu-desktop but much to my dismay, lots of applications came with it that I didn't want.

I apt-get removed xubuntu-desktop but it turns out I had to go through each programme and remove it manually anyway, now that I have done that, I have a proper desktop apart from the login screen still shows the Xubuntu theme.

How can I change it to its original Ubuntu default theme?

Is there a way that avoids installing Ubuntu Tweak?

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It seems an age now, but you could use gksudo gdmsetup to customise your GDM login screen. This seems to have been dropped after Karmic.

If you want to re-theme your GDM, add gnome-appearance-properties to GDM's autostart folder:

sudo ln -s /usr/share/applications/gnome-appearance-properties.desktop /usr/share/gdm/autostart/LoginWindow

Log out.

The appearance properties window will appear on the GDM login screen.

Configure GDM how you want, then close the window and log back in.

When you're done and want the window to stop opening with GDM, run:

sudo unlink /usr/share/gdm/autostart/LoginWindow/gnome-appearance-properties.desktop

Use this AU question and answer to reset the xubuntu gdm icon back to the canonical orange circle-of-friends.

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Reinstall the gdm package. This should reset everything like it was before the Xubuntu install.

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This answer would be improved if you were to explain specifically how to do this. – Eliah Kagan Aug 22 '12 at 10:33

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