This bug was fixed in the package systemd - 237-3ubuntu10.42

systemd (237-3ubuntu10.42) bionic; urgency=medium

  [ Dan Streetman ]
    - Add IgnoreCarrierLoss and default to value of ConfigureWithoutCarrier
      (LP: #1860926)
  * d/e/rules-ubuntu/40-vm-hotadd.rules:
    - Hotadd only offline memory and CPUs
      (LP: #1876018)
  * d/p/lp1881972-network-strdup-iif-and-oif-when-creating-RoutingPoli.patch:
    - Avoid double-free by strdup'ing iif/oif strings for new policy rules
      (LP: #1881972)
  * d/p/lp1886197-seccomp-more-comprehensive-protection-against-libsec.patch
    - Fix FTBFS on arm64 due to libseccomp changes (LP: #1886197)
    - Try unmounting even if ro-remount fails, and don't bother remounting 
api/ro fs
      (LP: #1832754)

  [ Alex Murray, Jamie Strandboge ]
  * d/p/lp1886115-pid1-fix-free-of-uninitialized-pointer-in-unit_fail_.patch:
    - Fix free of uninitialized pointer (LP: #1886115)

 -- Dan Streetman <>  Wed, 08 Jul 2020 14:59:14

** Changed in: systemd (Ubuntu Bionic)
       Status: Fix Committed => Fix Released

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  "shutdown[1]: Failed to wait for process: Protocol error" at shutdown
  or reboot and hangs.

Status in systemd:
  Fix Released
Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Bionic:
  Fix Released

Bug description:

  shutdown sometimes fails to unmount some fs, which causes shutdown

  [test case]

  it's unclear what the specific configuration is to be able to
  reproduce this, but there are some examples in the upstream bug

  [regression potential]

  as this adjusts shutdown umounting, any regression would likely
  involve either failure to unmount some filesystems on shutdown and/or
  failure to shutdown the system.


  this is needed for b.

  this is fixed upstream by PR 8429 which is included starting in v239,
  so this is fixed already in Focal and later.

  this was caused by upstream commit d5641e0d7e8 which was added in
  v236, so this bug is not present in x.

  [original description]

  I am using Xubuntu 18.04 64 bit and got "shutdown[1]: Failed to wait
  for process: Protocol error" at shutdown or reboot and hangs.

  systemd: 237-3ubuntu10.22

  It's this issue:

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