I believe this bug was fixed in Update manager for metacity.
It no longer appears while using metacity as the WM, however , it does still
happen when using compiz.
Also see similar bug but specific for compiz > Bug #391479
** Changed in: hundredpapercuts
Status: New => Incomplete
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'Downloading package information' and 'building dependency tree' progress
dialogs request focus too often
https://bugs.launchpad.net/bugs/35876
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