I installed some KDE stuff by mistake. After removing it, my login screen now is quite different; has a white background and the user icons+input appear in the centre.
[note that I have tried sudo dpkg-reconfigure lightdm; amongst other things]
How do I revert back to the default Ubuntu 13.10 x64 desktop one?
You just have to edit your /etc/lightdm/lightdm.conf file, and change this line
greeter-session=lightdm-kde-greeter
to this one
greeter-session=unity-greeter
Or simply reconfiguring the greeter (not the Desktop Manager) might work also:
sudo dpkg-reconfigure unity-greeter
According to falconer answer you can change
greeter-session=unity-greeter
In my case (ubuntu 16.04 LTS), config is located in:
/usr/share/lightdm/lightdm.conf.d/60-lightdm-gtk-greeter.conf
useful link about login screens
