after years of suffering with this bug, I found a solution that works for me.
I put a pre-down dispatch script for network manager to dismount nfs shares
when bringing the network down. This works even if a reboot is run from a
shell.
In /etc/NetworkManager/dispatcher.d/nfs.sh:
/etc/NetworkManager/dispatcher.d/pre-down has a link to it as well.
#!/bin/bash
IF=$1
STATUS=$2
logger -s "********************** NetworkManager dispatch script nfs, IF="$1"
STATUS="$2
case "$2" in
pre-down)
umount -a -t nfs
service cups stop
;;
up)
mount -a -t nfs
;;
esac
I do NOT use the systemd automount fstab option as it'll try to
automount when this script is trying to dismount the nfs shares.
I also have it stop cups as kubuntu sometimes hangs bringing cups down.
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https://bugs.launchpad.net/bugs/1438612
Title:
remote file systems hang on shutdown, D-BUS stops too early
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