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I'm using this link but seems to be not working on 12.04, here's the Terminal message below: Are there other softwares/tips for changing the login screen? I'm also using link but seems outdated.

Failed to fetch  404  Not Found

W: Failed to fetch  404  Not Found

W: Failed to fetch  404  Not Found

E: Some index files failed to download. They have been ignored, or old ones used instead.
law@ubuntu:~$ sudo apt-get install simple-lightdm-manager
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package simple-lightdm-manager
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You can use Ubuntu Tweak to change the background of your login screen. Hare's a guide. – Basharat Sialvi May 27 '12 at 5:26

Just change the background on the desktop, choose one of the pre-configured images, and that will do it.

enter image description here

If you want to use your own image then click on the + sign, add your image, and then change the permissions

enter image description here

on the image for group read and write and other to be read only.

And that will do it. No need to use anything else.

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I dunno maybe it's my own image, tried 3 images, still not working. – userIsAMonkey May 27 '12 at 6:05
I had a problem with low resolution images. Try using a high resolution image. Need more help, do not hesitate to ask. – Mitch May 27 '12 at 6:07
Thanks, I'll try, what resolution would you recommend? I used 1440x900 – userIsAMonkey May 27 '12 at 6:09

If your home folder is encrypted, the login screen software will not be able to access your photo folder.

My solution to this problem was to create a folder outside my home folder to store wallpapers.

cd /
sudo mkdir wallpaper
sudo chown USERNAME /wallpaper
sudo chgrp USERNAME /wallpaper

Copy your wallpapers to that folder. Then when you set a desktop background, the login background will change as well.

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