Older versions of Ubuntu come with the ability to set the wallpaper to a single color or primary and secondary colors to achieve a gradient look using the background settings menu. However, Ubuntu has removed this feature in newer versions of Ubuntu. However, you can use the terminal to set and change the background to a solid color. Follow the steps below to set a solid color for the background instead of the wall image.
Set the wallpaper to plain on Ubuntu.
Open a terminal (ctrl + alt + t) and run the following command to remove the current background image.
gsettings set org.gnome.desktop.background picture-uri ""
Then run the following command to set the primary solid color
gsettings set org.gnome.desktop.background primary-color '#000000'
here”# 000000“(Black) In your favorite color.
Then use the following command to set the background type to solid.
gsettings set org.gnome.desktop.background color-shading-type 'solid'
Set the wallpaper to a gradient look color on Ubuntu.
If you want a gradient look, use the following command to set the secondary color.
gsettings set org.gnome.desktop.background secondary-color '#ffffff'
“#ffffff(White) With your favorite color.
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Next, the background is “Horizontal‘Or’vertical“
gsettings set org.gnome.desktop.background color-shading-type 'horizontal'
gsettings set org.gnome.desktop.background color-shading-type 'vertical'