Software updater no longer functional

[MR ZenWiz]

On Tue, Jan 24, 2017 at 1:58 PM, Colin Law <clanlaw at gmail.com> wrote:
> On 24 January 2017 at 21:37, MR ZenWiz <mrzenwiz at gmail.com> wrote:
>>
>> First, thanks to all who responded.  Unfortunately, none of the
>> suggestions has had any impact.  The apt-get commands all succeeded
>> without any fuss or significant output.  The updater indicator remains
>> a red dot with the white line through it, and the updater fails every
>> time.  If I click on the "Show Updates", it does nothing.  If I click
>> "Check for updates", it goes out and get the updates to display, but
>> when I click on "Install Now", the updater shows a blank update window
>> and never does anything.
>
> Have you recently updated to 16.04? In which case perhaps [0] is
> related. In fact it may be related anyway.
>
> What does apt-cache policy update-manager show?
>
> Colin
>
> [0] https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1573177
>
admar at marbase:~/Downloads $ sudo apt-cache policy update-manager
[sudo] password for admar:
update-manager:
  Installed: 1:16.04.5
  Candidate: 1:16.04.5
  Version table:
 *** 1:16.04.5 500
        500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main
amd64 Packages
        500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main
i386 Packages
        100 /var/lib/dpkg/status
     1:16.04.3 500
        500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        500 http://us.archive.ubuntu.com/ubuntu xenial/main i386 Packages

I see the errors noted in the bug - I posted a text file with them in
it at the beginning of this thread.

I've done a fair number of updates since 9/9/2016, and the error is
still happening.  Is there another patch I can/need to install?