Closing report.
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** Changed in: update-manager (Ubuntu)
Status: New => Invalid
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I found that the file
/etc/apt/sources.list.d/private-ppa.launchpad.net_commercial-ppa-
uploaders_fullcircle-issue-56_ubuntu.list
only had root read permission, unlike the rest of the files in that
directory. When I added universal read permission, the software center
and the update manager star