How to change the login screen wallpaper
You can install gdm-settings with
sudo apt install gdm-settings libglib2.0-dev-bin
If you also like to set a custom background for the lockscreen, you can use an extension
Install the extension-manager with
sudo apt install gnome-shell-extension-manager
then you can install and manage the extensions with it.
That may be one
or that
Here are some guides how to install the extensions if you are interested:
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No bro cant able to change
"Bro, it didn't work" is too vague to meaningfully respond to.
It leaves unknown what steps you tried; if a step was missed, if you got any error messages, etc.
This is a collaborative effort where you as the end user puts in effort and any assisting helper (In this case Forpli) puts in effort; not a one sided deal.
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What didn't work? Did You tried everything? The GDM Method should be the easiest Thing. When installed with the Command from @Forpli, You open it and on the first Option is directly the Setting for the Background Picture:
When done, click in the top left Corner on ''Apply'' and then reboot.
Now it is working thanks