Login Screen/Background Change? (kubuntu)

Question

I have Kubuntu 13.04 (last version) and lightdm

I want to change my login screen background (not my wallpaper after I type my password. I'm talking for the image you see WHEN you type your password). It shows a greyish "image" right now. When I tried to use a picture from home and restarted the screen became white and it didn't show my image. I searched and found out that it because of some setings.

The problem is I'm very new to kubuntu and I don't want to mess things up with complicated setting from the terminal etc or to mess aroud with the root files because I won't be able to fix things.

Is there a simple solution as to how can I change this image? There is no option for me to download something there but only to load a picture.

Thank you very much in advance

Solution

At here

KDE System Settings > Login Screen (LightDM); Theme tab

Background image

and the log in screen has new background.

Why it is not working - White background - Check these

1) The image file has wrong extension

Tested with jpg picture with the png extension. The file properties is showing the right image format.

Right click the file > Properties: Information tab

The picture should have correct extension - If not the LightDM can't read the picture data.

2) The image file has wrong permissions

The user has forbidden the read of the image.

Right click the file > Properties: Permissions tab

The Owner/Group/Others should have the right to read the picture data.

Comments

[Lucky Strike]

It worked! :D It was the image setting that was the problem. Thank you very much! It was extremely helpful :D Now all I have to do is figure out how to change profiles with this format :P Thank very very much :)

[Anders]

You need to have the right premissions on the directories too. From top root directory / down through all to /h/[u]/.kde/s/wallpapers. So see to it that they have at least x rights, and possible r rights on wallpapers. The directories above wallpapers only need r if you want to give the right to list the contents of that directory. But as you know the names inbetween, you only need x to have access to it and lower directories/files.