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https://bugs.launchpad.net/bugs/1773033

Title:
  unattended upgrade no longer actions on shutdown

Status in unattended-upgrades package in Ubuntu:
  Fix Released
Status in unattended-upgrades source package in Bionic:
  Fix Released

Bug description:
  [Impact]

   * Unattended-upgrades does not install upgrades when it is configured
  to install updates on shutdown and when it the system is started on
  battery, but installs updates on battery in other cases.

   * This behaviour is unintended and confuses users, moreover
  installing updates on battery risks the system to be shut down in the
  middle of an upgrade due to depleting the battery.

   * This upload changes u-u to skip updates or gracefully stop when the
  system is switching to batter-powered state by default minimizing the
  risk of breaking the system.

  [Test Case]

   * Run "unattended-upgrade --dry-run --verbose" on battery and on AC
  power

   * With default configuration u-u should stop with the following message on 
battery:
  Initial blacklisted packages: 
  Initial whitelisted packages: 
  Starting unattended upgrades script
  Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, 
o=UbuntuESM,a=bionic
  System is on battery power, stopping

   * On AC power it should continue:
  $ sudo ./unattended-upgrade --dry-run --verbose
  Initial blacklisted packages: 
  Initial whitelisted packages: 
  Starting unattended upgrades script
  Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, 
o=UbuntuESM,a=bionic
  No packages found that can be upgraded unattended and no pending auto-removals

   * Add the following configuration file and check u-u continuing even on 
battery:
  $ cat /etc/apt/apt.conf.d/51unattended-upgrades-on-battery 
  Unattended-Upgrade::OnlyOnACPower "false";
  rbalint@yogi:~/projects/deb/unattended-upgrades$ sudo ./unattended-upgrade 
--dry-run --verbose
  Initial blacklisted packages: 
  Initial whitelisted packages: 
  Starting unattended upgrades script
  Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, 
o=UbuntuESM,a=bionic
  No packages found that can be upgraded unattended and no pending auto-removals

  
  [Regression Potential] 

   * Unattended-upgrades may fail to install updates even on AC power,
  but this is unlikely to happen due to the code changed being fairly
  simple. on_ac_power may return 255 (false) Power status could not be
  determined, but this is mapped to being on AC power and installing the
  updates, only subprocess.call("on_ac_power") == 1 makes u-u skip
  updates.

  [Original Bug Text]

  Ubuntu 17.10 and 18.04 do not install updates with InstallOnShutdown
  flag set.

  post-install script on 14.04 and 16.04 would set options in
  /etc/apt/apt.conf.d/50unattended-upgrades and
  /etc/apt/apt.conf.d/10periodic to install updates on shutdown of
  ubuntu desktop. This worked on 17.10 also, until an update before the
  release of 18.04. After a fresh install of 18.04, ran the post install
  script. Below is the contents of the two files, updates do not run,
  even if performing an apt update and leaving the machine up for a few
  hours to download packages in the back ground. Both the unattended-
  upgrades and unattended-upgrades-shutdown log files are empty.

  Description:  Ubuntu 18.04 LTS
  Release:      18.04

  ii  unattended-upgrades                        1.1ubuntu1
  all          automatic installation of security upgrades

  
----------------------/etc/apt/apt.conf.d/50unattended-upgrades----------------
  Unattended-Upgrade::Allowed-Origins {
          "${distro_id}:${distro_codename}";
          "${distro_id}:${distro_codename}-security";
          // Extended Security Maintenance; doesn't necessarily exist for
          // every release and this system may not have it installed, but if
          // available, the policy for updates is such that unattended-upgrades
          // should also install from here by default.
          "${distro_id}ESM:${distro_codename}";
          "${distro_id}:${distro_codename}-updates";
  //      "${distro_id}:${distro_codename}-proposed";
  //      "${distro_id}:${distro_codename}-backports";
          "LP-PPA-libreoffice:${distro_codename}";
          "Canonical:${distro_codename}";
  };

  Unattended-Upgrade::Package-Blacklist {
  //      "vim";
  //      "libc6";
  //      "libc6-dev";
  //      "libc6-i686";
  };

  Unattended-Upgrade::DevRelease "false";
  Unattended-Upgrade::InstallOnShutdown "true";
  Unattended-Upgrade::Remove-Unused-Dependencies "true";

  ---------/etc/apt/apt.conf.d/10periodic:----------------------
  APT::Periodic::Update-Package-Lists "1";
  APT::Periodic::Download-Upgradeable-Packages "1";
  APT::Periodic::AutocleanInterval "7";
  APT::Periodic::Unattended-Upgrade "1";

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