Well, this is an old problem when xenial is not released, but now fixed!
** Changed in: metacity (Ubuntu)
Status: New => Fix Released
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Is this still problem?
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Title:
Metacity with composite rendering error for GUI menu border
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** Attachment added: "snapshot of bug"
https://bugs.launchpad.net/ubuntu/+source/metacity/+bug/1518780/+attachment/4523780/+files/a.png
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