This article covers different methods to modify Ubuntu Desktop Background as well as updating your background by using the command prompt. When you first install and run Ubuntu Linux the first thing you see when you log in is the default desktop. It has the Ubuntu brown color scheme and panels at the top and bottom of the screen. There are two predominant desktop environments available with Linux - the GNOME desktop and the KDE desktop. Which is the best desktop is matter of preference and heated disagreement in the Linux community. Both are excellent, feature rich desktops.
How to Change the desktop background in Ubuntu ?
To change the image used for your backgrounds:
1. Open the Activities overview and start typing Background.
2. Click Background to open the panel. The currently selected wallpaper is shown at the top.
3. There are two ways to change the image used for your backgrounds:
i. Click one of the background images which are shipped with the system.
Some wallpapers change throughout the day. These wallpapers have a small clock icon in the bottom-right corner.
ii. Click Add Picture… to use one of your own photos. By default, the Pictures folder will be opened, since most photo management applications store photos there.
4. The settings are applied immediately.
For another way to set one of your own photos as the background, right-click on the image file in Files and select Set as Wallpaper, or open the image file in Image Viewer, click the menu button in the titlebar and select Set as Wallpaper.
5. Switch to an empty workspace to view your entire desktop.