[Bug 1661611] Re: apt/unattended-upgrades stalls shutdown

[kay]

It doesn't relate to "/usr/share/unattended-upgrades/unattended-upgrade-
shutdown" file at all. When you "fix" it - it just fails because of the
invalid python syntax. And shutdown just works.

The real problem is systemd dependencies. Here is the log of the shutdown process:
Unattended upgrades should be started before filesystem unmount, but it starts after unmount:

[  OK  ] Unmounted /home.
[  OK  ] Stopped File System Check on /dev/mapper/VG-home.
[  OK  ] Unmounted /var.
[  OK  ] Stopped File System Check on /dev/mapper/VG-var.
[  OK  ] Unmounted /boot.
[  OK  ] Stopped File System Check on /dev/mapper/VG-boot.
[  OK  ] Removed slice system-systemd\x2dfsck.slice.
[  OK  ] Stopped Login to default iSCSI targets.
         Stopping iSCSI initiator daemon (iscsid)...
[  OK  ] Stopped iSCSI initiator daemon (iscsid).
[  OK  ] Stopped target Network is Online.
[  OK  ] Stopped target Network.
[  OK  ] Stopped Initial cloud-init job (metadata service crawler).
         Stopping Raise network interfaces...
[  OK  ] Stopped Raise network interfaces.
[  OK  ] Stopped target Local File Systems.
         Unmounting /run/user/1000...
         Starting Unattended Upgrades Shutdown...
[  OK  ] Stopped Apply Kernel Variables.
[  OK  ] Stopped target Network (Pre).
[  OK  ] Stopped Initial cloud-init job (pre-networking).
[  OK  ] Stopped Load Kernel Modules.
[  OK  ] Unmounted /run/user/1000.
[  OK  ] Reached target Unmount All Filesystems.
[  OK  ] Stopped target Local File Systems (Pre).
[  OK  ] Stopped Create Static Device Nodes in /dev.
         Stopping Monitoring of LVM2 mirrors... dmeventd or progress polling...
[  OK  ] Stopped Remount Root and Kernel File Systems.
[  OK  ] Stopped Monitoring of LVM2 mirrors,...ng dmeventd or progress polling.
         Stopping LVM2 metadata daemon...
[  OK  ] Stopped LVM2 metadata daemon.


And it is reproducible with LVM only. Have to spend some time on investigation.

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https://bugs.launchpad.net/bugs/1661611

Title:
  apt/unattended-upgrades stalls shutdown

Status in unattended-upgrades package in Ubuntu:
  Confirmed

Bug description:
  When unattended-upgrades is installed, 9 out of 10 shutdowns/reboots
  hang while "starting unattended upgrades shutdown". This hang stalls
  the shutdown process for 5-10 mins.

  If I disable unnattended-upgrades via the /etc/apt/apt.conf.d/20auto-
  upgrades and/or 50unattended-upgrades, the problems occurs.

  If I terminate the service before shutdown/reboot (sudo service
  unattended-upgrades stop) the problem still occurs.

  If I remove the package (sudo apt remove unattended-upgrades) the
  problem no longer occurs.

  This occurs on a freshly installed version of Ubuntu Server 16.04.1
  (both unattended-upgrades installed via install GUI or manual install
  of unattended-upgrades)

  Both Kern.log & syslog do not show the shutdown process (I believe
  because the filesystems have already unmounted)

  Original report: http://askubuntu.com/questions/878630/apt-unattended-
  upgrades-stalls-shutdown

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