Ok, try running the update-manager as sudo like this:
gksu update-manager
See if that corrects the problem and report back. Also, leave the
status set to "incomplete" as we are working on this bug. Thanks.
** Changed in: update-manager (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/769817
Title:
Installation progress dialog not visible
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