[Bug 1709384] Re: failed to unmount filesystems during shutdown, reboot hangs

[Dimitri John Ledkov]

• disable pam_systemd in the pam session config

I do not believe we can support Ubuntu systems that do that. pam_systemd
is essential on ubuntu systems.

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https://bugs.launchpad.net/bugs/1709384

Title:
  failed to unmount filesystems during shutdown, reboot hangs

Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  i'd done a new install of 17.04, and this had been working ok.  this
  morning, i did an update, and now the system complains about being
  unable to unmount certain filesystems, as well as hanging during the
  shutdown process upon displaying "[ ok ] reached target shutdown"

  Aug  8 16:11:48 template systemd[1]: Failed unmounting /home/foo.example.com.
  Aug  8 16:11:49 template systemd[1]: Failed unmounting /var/log.
  Aug  8 16:11:49 template systemd[1]: Failed unmounting /tmp.
  Aug  8 16:11:49 template systemd[1]: Failed unmounting /home.
  Aug  8 16:11:49 template systemd[1]: Failed unmounting /var.

  1] >lsb_release -rd
  Description:	Ubuntu 17.04
  Release:	17.04

  2] >apt-cache policy systemd
  systemd:
    Installed: 232-21ubuntu5
    Candidate: 232-21ubuntu5
    Version table:
   *** 232-21ubuntu5 500
          500 http://us.archive.ubuntu.com/ubuntu zesty-updates/main amd64 Packages
          500 http://security.ubuntu.com/ubuntu zesty-security/main amd64 Packages
          100 /var/lib/dpkg/status
       232-21ubuntu2 500
          500 http://us.archive.ubuntu.com/ubuntu zesty/main amd64 Packages

  3] i expected the system to not fail when unmounting filesystems during shutdown
  4] it did

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