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I have Ubuntu 12.04 LTS installed. Can someone tell me how can I change/replace the Ubuntu login logo with mine or my name?

Please give full steps involved, because I am new to Ubuntu.

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Change the image /usr/share/unity-greeter/logo.png with what do you wish, but keep the same name (logo.png) for the image.

First, copy your actual Ubuntu logo in a safety location, using terminal:

cp /usr/share/unity-greeter/logo.png ~/Pictures/ubuntu_logo.png

Then copy a new logo in /usr/share/unity-greeter/:

sudo cp  ~/Pictures/google_logo.png /usr/share/unity-greeter/logo.png

After a system restart you can see the difference:

login screen

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