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my lightdm became curious look like in the picture. how to restore the original look like Ubuntu?lightdm

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It would help if you would edit your question explaining the modifications you made to the default login screen –  Jorge Castro Jul 21 '12 at 5:11
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It appears you have somehow switched to GDM instead of LightDM. Please open a terminal and run sudo dpkg-reconfigure lightdm; you will get a selection box, select LightDM and then OK. Reboot. –  izx Aug 18 '12 at 13:13

1 Answer 1

You need to install unity-greeter and configure lightdm to use it. You are running the gtk greeter now for some reason. When lightdm is mis-configured it enters "low graphics" mode. You can confirm the reason by looking at /var/log/lightdm.log

Make sure unity-greeter is installed. You can easily do this by just reinstalling it with apt sudo apt-get install unity-greeter.

Edit lightdm.conf, it should look like this (below), the key line being "greeter-session=unity-greeter"

[SeatDefaults]
user-session=ubuntu
greeter-session=unity-greeter
allow-guest=false

After you do that, start lightdm from a virtual terminal. sudo initctl start lightdm. I'm not sure if lightdm is "running" when in low-graphics mode, if so, stop it first with sudo initctl stop lightdm.

Note: You do NOT need to uninstall the lightdm-gtk-greeter, just leave it for a backup or once everything is working, then you can remove it if you want.

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