Thank you for reporting this bug to Ubuntu. 10.04 reached End of Life in 2015.
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I've tried recreating this bug with your release and was unable to,
given the information you've provided. Please upgrade to U
Also the same problem exists not only in the upper edges as you can see
at the screenshot. The other two edges have the same problem
--
Window border not displayed correctly in mutter
https://bugs.launchpad.net/bugs/586349
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