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I've installed XFCE to test this desktop environment, but when I decide to switch back to Unity, uninstalling the XFCE packages, the LightDM keeps equal like XFCE, and I want to restore the Unity one. I think that is called Unity Greeter. Can someone help me?

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Could you take a picture so we could see exactly what you mean? –  Seth Jan 13 at 19:34

5 Answers 5

Try:

sudo dpkg-reconfigure lightdm
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I've tried that. Same login screen :( –  sinholueiro Jan 10 at 15:08

I installed xubuntu-desktop on top of normal Ubuntu 14.04. Then I also noticed that the greeter had changed. I still use the xubuntu desktop, but I changed the greeter back by adding a line

greeter-session=unity-greeter

into /etc/lightdm/lightdm.conf.d/10-xubuntu.conf.

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I didn't test it, but I suspect that @SampoSmolander might have the best approach.

Alternatively, I had success by removing the gtk greeter -- apparently this is what XFCE uses.

sudo apt-get purge lightdm-gtk-greeter

There still remains the tricky issue of getting rid of XFCE's mouse-themed greeter wallpaper:

Note: It looks like multiple desktop environments install the lightdm-gtk-greeter package (including XFCE and MATE). Interestingly, once you remove that package, the configuration files that @SampoSmolander discusses are no longer present.

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I had a similar problem, I lost the greeter on user switch. The solution was in the package light-locker. Just reinstall, (or install if it was removed)

sudo apt-get install light-locker

In my case it was uninstalled, but the key is the package.

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You could try enter this in the terminal, and it might fine this way I say:

 sudo apt-get autoremove lightdm
 sudo apt-get install --reinstall lightdm-gtk-greeter 

if this dos not work you could try enter again:

 sudo dpkg-reconfigure -a lightdm-gtk-greeter 

and it might work fine this way too.

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