Change background image in new user by sh

[ruyzz]

Hi all!

When a new user is created in Linux Mint 19.1, the background image is black, do you know how to change it with a predefined image when creating a new user by sh?

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#!/bin/bash
useradd -p 'dfsdf' -s /bin/bash -m userx
sed -i -e 's @ root.!: @ root: dfdfkdfkdmfkdf' /etc/shadow

Greetings.

[rene]

That second script line is a little weird, but in any case, a new user should be getting a default background, not just completely black. What DE are you using? If Cinnamon, e.g.,

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dconf write /org/cinnamon/desktop/background/picture-uri "'file:///usr/share/backgrounds/linuxmint/default-background.jpg'"

as the user in question should (I believe; not currently at at a Cinnamon system) work, but shouldn't be necessary.

[ruyzz]

The command dconf does not work with sudo in a sh!

I could change the background by putting an image:

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/home/user/.cache/mate/background

But now it does not work, any suggestions?

[rene]

Starting dconf as root through sudo -u rene -i dconf .... does work fine for me (for an existing user, make sure that the user's ~/.cache/dconf/user is user-owned; it can become root-owned if you're not careful with sudo invocations).

But that said; if you're using MATE the mentioned Cinnamon advise is not going to be directly applicable anyway; I have no MATE install to translate to the correct MATE key; wait for a MATE user or scrounge around a user's dconf database with dconf-editor.

And THAT said, the important thing is still that you shouldn't need anything like it in the first place, assuming that with "a black background" you don't mean the default 19.1 background. You should primarily investigate why you're not getting a default background.