How to change Login Screen background in Ubuntu 11.10 LightDM
Ubuntu 11.10 Oneiric Ocelot has released its second alpha. In Ubuntu Oneiric, it starts using LightDM as default to instead Gnome Display Manager(GDM). If you have upgraded to or new installed Ubuntu 11.10 Oneiric, you might want to change the LightDM login screen background. And it’s easy, just open up a terminal window and edit the configuration file with the command below(Here unity-greeter.conf is the default theme’s configuration file, it changes depend on what greeter theme you’re using) :
gksu gedit /etc/lightdm/unity-greeter.conf
Find the similar line:
background=/PATH/TO/Login/Background
Change the path to any image as you like.
(Source : http://ubuntuguide.net/)
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I found that to install any plug-in or application or anything we have to put our administrator password so i tried to remove it but failed finally i found a unlock icon in the user account menu and click it and entered the password..then when i moved to change password option it have an option to NOT to have a password………and then i installed my plug in to play clips…….when next time i boot i was shown that thing again while downloading VLC player and i tried to put the previous password but it shows your authentication attempt was unsuccessful please try again and now i cant install any plug in or software……then i checked user account menu and under password option it is written “None” then i clicked unlock option and it says the same thing…..what to do