It works if the background image is very low resolution. Try this
attached image.
I'm reassigning since GNOME dropped the UI for settings zoom/scale/title
in their Background panel, but it still exists in the Unity Appearance
panel.
** Attachment added: background-fill.png
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You received this bug notification because you are a member of Ubuntu
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https://bugs.launchpad.net/bugs/994004
Title:
Appearance panel doesn't show correct preview when set to Center or
Tile
To manage notifications about
** Changed in: gnome-control-center (Ubuntu)
Importance: Undecided = Low
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You received this bug notification because you are a member of Ubuntu
Desktop Bugs, which is subscribed to gnome-control-center in Ubuntu.
https://bugs.launchpad.net/bugs/994004
Title:
Appearance panel doesn't show