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I just reinstalled my Ubuntu (I've 12.04), installed Gnome 3, and I want my login screen look like this (I've had it before but I really don't remember how I did it). I tried to search for "gnome login screen" but nothing useful showed up.

This is the login screen I want:

what I want

This it the login screen I have now:

what I have

Any idea how to get it? At least what is the name of this "theme" ?

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What options does the command sudo dpkg-reconfigure lightdm give you? I used this command to change the display manager to gdm and the theme looked as you want it to look. –  edwin Jun 25 '13 at 22:01
dpkg-reconfigure lightdm Package `lightdm' is not installed and no info is available. /usr/sbin/dpkg-reconfigure: lightdm is not installed But I've already done dpkg-reconfigure gdm so I think it is set to GDM now –  hoci kto Jun 25 '13 at 23:10
Then, are you sure you have gdm3 installed? Try gdm --version just to be sure. If you have gdm3 try installing lightdm, changing to it, and rebooting. Login into the Unity session, then sudo apt-get purge gdm gnome-shell && sudo apt-get autoremove, reboot, then reinstall Gnome Shell with sudo apt-get install gnome-shell. Last, change again to gdm via dpkg-reconfigure and reboot to see if it worked. –  edwin Jun 26 '13 at 0:13
I just found out that I have gdm 3.0.4 but the newest version is 3.8, and it is not available for Ubuntu 12.04, anyway thanks for help –  hoci kto Jun 26 '13 at 0:36
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