[Bug 1577885] Re: 120sec delay during shutdown or reboot with still mounted cifs (via Wifi)

[Anatoli]

Maintainers, please set a priority (severe IMO) and assign this bug to
someone, it's extremely annoying to wait up to 5 minutes for the
computer to shutdown and get some errors during the process.

Network-manager should have some mechanism to instruct it not to
shutdown the network before some signal or other indication. It can't
just cut the network when other processes are using it. Maybe an order
of shutdown could be defined via systemd.

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https://bugs.launchpad.net/bugs/1577885

Title:
  120sec delay during shutdown or reboot with still mounted cifs (via
  Wifi)

Status in network-manager package in Ubuntu:
  Confirmed
Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  Using Ubuntu 16.04 Desktop with Unity, used the same approach in 14.04
  with no issue.

  I prepare for mounting with the following entry in /etc/fstab my
  Synology NAS :

  //192.168.178.61/data /media/server/server_data cifs
  users,uid=1000,gid=1000,username=xxxxx,passwd=xxxxxx,iocharset=utf8,sec=ntlm,noauto,_netdev
  0

  After login to unity, I mount it with a bash-script (mount -a) which
  is called from ~/.config/autostart/myMounts.desktop

  Doing this, and shuting down or rebooting lead into a very delayed
  shutdown (round about 2 minutes) Pressing ESC Key, showed that the
  process stops at the command "umount /media/server ..."

  I have not tested if this also occurs when I am connected via
  ethernet. I think it is because the (Wifi)Network is already disabled
  prior all umounts are done.

  This issue happens even if I type in a shutdown command into a
  Terminal or if I choose shutdown form the menue, also if I use the
  power-button.

  Failure can be avoided if I umount the network-drives manually
  previouse to reboot.

  Interim solution was, to create an alias for "shutdown" like "sh
  /path/to/umount/script.sh && shutdown" in /etc/bash.bashrc.local.

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