[Bug 1645115] Re: Auto update frequency isn't proper

[Tyler Hicks]

Also, while looking through the /var/log/apt/history.log on that
machine, I note that you won't see unattended-upgrade entry every day.
Instead, you'll only see those entries when there's a security update
available from xenial-security. Note that you may have other pending
updates, from xenial-updates, but those aren't security updates and will
not be applied automatically.

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Title:
  Auto update frequency isn't proper

Status in unattended-upgrades package in Ubuntu:
  Incomplete

Bug description:
  With Ubuntu 16.04:

  I suspect that security updates aren't installed immediately:

  The file "/var/log/apt/history.log" shows that "/usr/bin/unattended-upgrade" is executed every 2-3 days.
  By reading the "Software Updater" app/GUI I see that there are security updates available which weren't installed.

  In "Software & Updates", under the "Updates" tab:
  The field "When there are security updates: " is set to the value "Download and install automatically".
  Also all checkboxes at the top (below "Install updates from: ") are checked (with a V ).

  Note that the file "/etc/apt/apt.conf.d/50unattended-upgrades"
  contains only comments (lines starting with "//").

  Version of unattended-upgrades: 0.90ubuntu0.2

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