[Bug 1618900] Re: [Xenial/0.90] Systemd dependencies issues when used in "Shutdown mode"

[Martin Pitt]

Oh, actually not -- that would be for a service which gets *stopped*
during shutdown (i. e. the usual way). If you want to *start* on
shutdown, you need to be Before=network.target.

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Title:
  [Xenial/0.90] Systemd dependencies issues when used in "Shutdown mode"

Status in unattended-upgrades package in Ubuntu:
  Confirmed

Bug description:
  Using unattended-upgrades 0.90 in "Shutdown mode" on Ubuntu Xenial, we encounter the following systemd dependencies issues :
  - The network is often down when unattended-upgrades is running, so packages can not be downloaded (can be mitigated by using APT::Periodic::Download-Upgradeable-Packages "1";) :
      => ERROR An error occurred: 'Could not resolve host: ****.fr'
      => ERROR The URI 'https://****.fr:33000/ubuntu-security/pool/main/libi/libidn/libidn11_1.32-3ubuntu1.1_amd64.deb' failed to download, aborting
  - Important mountpoints like /boot are unmounted before unattended-upgrades is running, so newer kernels can not be installed properly (ramdisk and grub configuration can not be generated)

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