Software updater no longer functional

[Colin Law]

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