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I installed xfdesktop and my login screen and background were changed to the green screen and the mouse :( I managed to change the background back to my selection, but the login screen has not changed. I looked for the solution on the forum, it said to add the selected picture into usr/share/backgrounds/ I found the folder but it does not let me delete pictures in there, it says I don't have the permission? How to get in there WITH permissions? Thanks! Fred

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Fred,

Here is one method for changing the login screen for Elementary OS - Juno.

  1. Save a picture of your choice in ~/Pictures
    For simplicity sake, my login picture will be called Login.jpg (restricting the filename of your picture to a single word followed by .jpg makes this easier, but that is not a necessity).
  2. open Terminal via Applications -> Terminal (or Win+T)
  3. Type: cd /usr/share/backgrounds
  4. Type: sudo rm elementaryos-default
    NOTE: Enter your login password when prompted.
  5. Type: sudo cp ~/Pictures/Login.jpg Login.jpg
  6. Type: sudo ln -s Login.jpg elementaryos-default
  7. Type: ls -al (check all folder privileges - everything should look identical)
  8. Deleting a picture in this directory can be accomplished with sudo rm pictureName.jpg Where pictureName is replaced with the filename of what you want to delete.
  9. Reboot

    Disclaimer: Using sudo gives you carte blanche (read: total control) over your system. Allow me to cite Ben Parker's words of wisdom:
    "With great power comes great responsibility."

Good luck.

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  • Thanks! In the end I used the sudo apt purge command to remove xfdesktop and it's all back to normal
    – Fred Constant
    Commented Feb 24, 2019 at 9:15
  • Hi, I used these commands, but ended up with a black screen. I also downloaded lightdm-gtk-greeter-settings, it allowed me to set the picture, BUT now I have an ugly login screen instead of the smooth clean one by default. I tried sudo apt remove and purge lightdm-gtk-greeter-settings but still that login screen remains. Any idea?
    – Fred Constant
    Commented Feb 28, 2019 at 13:03
  • 1
    Sorry for the delay, I had some major commitments that demanded my full attention. Anyway, if you perform steps 1-4 skip 5&6 and issue this command sudo ln -s ./Ashim\ DSilva.jpg elementaryos-default that would restore the original login screen after a reboot.
    – K. Capwell
    Commented Mar 10, 2019 at 23:57
  • Thanks! As I did a clean reinstall, the problem has gone. I think I'll stay clear of too much tweaking, eOS works great and looks great just as it is.
    – Fred Constant
    Commented Mar 11, 2019 at 10:15

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