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I'm using Ubuntu10.4 along with windows 7 and I'm changing wallpaper other than default but after restarting the system, screen remains completely black..

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It might be because the system cannot find/access the selected wallpaper after restart (due to folder/file permissions or unmounted partition, etc.?), maybe you can try copying/moving it to user-specific or system-wide folder for wallpapers (e.g. /home/you/.wallpapers, /usr/share/wallpapers, or "backgrounds" or something like this)? Alternatively, if you cannot get more or better answers, you may perhaps consider upgrading to the current Ubuntu version unless you have a good reason not to do so.

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All you need to do is

  1. Copy file to your Home directory (partition of Ubuntu)
  2. add 751 permission to that image you are using by

chmod 751 filename

It won't change when you restart.

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yes. I edited my answer. thanks. – Ankit Singhaniya Jul 7 '14 at 6:31

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