My recollection of the update manager is that you must click the little
expando-triangle to see details of what will be downloaded and updated.

So long as your apt sources are properly configured, all packages
downloaded and installed are signed for authenticity. The keys that are
used for validating the packages can be found via "apt-key list". This
is what makes it safe to download packages from mirror sites not
operated by Ubuntu. (Though mirrors that do not update frequently may
pose other problems, malware, viruses, and man-in-the-middle attackers
corrupting packages in transit should not be among them.)

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https://bugs.launchpad.net/bugs/1217843

Title:
  Software Updater won't display updates

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