chet
 first suggested:
> In Software & Updates, click on When there are security
updates:, and double check that Download automatically, or Download and
install automatically, are not selected.<

Correct: no automatic security updates.

Regarding chet's second suggestion, referring to the robpickering.com
article, my 50unattended-upgades file has only one line not commented
out, regarding security upgrades, exactly like the example quoted in the
 article.

As a further example, when I clicked on Software-Updater just now, an
update to ABrowser came through without any request for authentication after I clicked on "check for updates."

Do we have conflicting authorizations ? If I chose "no automatic
security updates" in Software & Updates, does that override or is it
 contramanded by the 50unattended-upgrades file ?

The present situation, wherein I cannot predict when Software Updater
will or will not ask for authorization, seems unacceptable from a
security standpoint.

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