Another thing. Please check for containers referencing the filesystems
in question. When you have _netdev filesystems, it is possible that the
"mount --shared" characteristics of containers (different mount
namescapes) are holding references to the filesystem in question.

A good test is to test the filesystem being mounted by /etc/fstab AND
manually. If mounted with _netdev, by /etc/fstab, then the containers
will have reference to the same filesystems as a shared mount. This will
cause a shutdown problem if you don't remove the container reference as
well.

Please do test this as well.

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https://bugs.launchpad.net/bugs/1569925

Title:
  Shutdown hang on 16.04 with iscsi targets

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