[Bug 1723761] Re: unattended-upgrade hangs on shutdown when network is required for updates

[Julian Andres Klode]

I guess I'll really have to do 1.6~alpha1 finally this week, so I'll put
it in there, and after we have verified and migrated the old SRUs, we
can do SRUs for stable releases as well (1.2.26, 1.4.9, 1.5.1).

This really is the APT problem with the most fixups ever :D :(

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https://bugs.launchpad.net/bugs/1723761

Title:
  unattended-upgrade hangs on shutdown when network is required for
  updates

Status in apt package in Ubuntu:
  Triaged
Status in unattended-upgrades package in Ubuntu:
  Fix Released

Bug description:
  Recently an update for flashplugin-installer on xenial was available
  in the ubuntu repositories.

  During the installation of this package a blob is downloaded from
  Adobe servers, which requires network connectivity/internet access.

  Because the network interface(s) have already stopped when this
  package is installed, the server cannot be reached, thus blocking the
  shutdown process until a timeout kills the unattended-upgrades
  process.

  On my machines the shutdown takes about 30 minutes in this case. The
  systemd configuration is standard here, except for a few additional
  services.

  A possible fix could be adding After=network-online.target
  NetworkManager-wait-online.service to After= in the systemd unit file.

  As a workaround I pinned the flashplugin-installer to -1:
  #echo >/etc/apt/preferences.d/forbid_flashplugin "\
  Package: flashplugin-installer
  Pin: release *
  Pin-Priority: -1";

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