Comment 12 for bug 954619

$ sudo apt-get dist-upgrade
...
Setting up nfs-common (1:1.2.5-3ubuntu2) ...
Installing new version of config file /etc/init/idmapd.conf ...
Installing new version of config file /etc/init/gssd.conf ...
Replacing config file /etc/idmapd.conf with new version
Replacing config file /etc/default/nfs-common with new version
idmapd stop/waiting
rmdir: failed to remove `/var/lib/nfs/rpc_pipefs': Directory not empty
dpkg: error processing nfs-common (--configure):
 subprocess installed post-installation script returned error exit status 1
No apport report written because MaxReports is reached already
                                                              dpkg: dependency problems prevent configuration of nfs-kernel-server:
 nfs-kernel-server depends on nfs-common (= 1:1.2.5-3ubuntu2); however:
  Package nfs-common is not configured yet.
dpkg: error processing nfs-kernel-server (--configure):
 dependency problems - leaving unconfigured
Setting up dmsetup (2:1.02.48-4ubuntu7) ...
No apport report written because MaxReports is reached already

$ sudo apt-get dist-upgrade
...
Setting up nfs-common (1:1.2.5-3ubuntu2) ...
rmdir: failed to remove `/var/lib/nfs/rpc_pipefs': Directory not empty
dpkg: error processing nfs-common (--configure):
 subprocess installed post-installation script returned error exit status 1

$ ls -l /var/lib/nfs/rpc_pipefs
total 20
dr-xr-xr-x 2 root root 4096 Apr 21 2007 lockd
dr-xr-xr-x 2 root root 4096 Apr 21 2007 mount
dr-xr-xr-x 2 root root 4096 Apr 21 2007 nfs
dr-xr-xr-x 2 root root 4096 Apr 21 2007 portmap
dr-xr-xr-x 2 root root 4096 Apr 21 2007 statd

$ mount |grep pipefs

$ fuser -vm /var/lib/nfs/rpc_pipefs
                     USER PID ACCESS COMMAND
/var/lib/nfs/rpc_pipefs:
                     root kernel mount /
                     cmiller 2640 Frce. gnome-session
                     cmiller 2682 .rce. gpg-agent
                     cmiller 2685 .rce. dbus-launch
                     cmiller 2686 .rce. dbus-daemon
                     cmiller 2692 .rce. gconfd-2
                     cmiller 2698 Frce. gnome-settings-
                     cmiller 2707 .rce. gvfsd
                     cmiller 2712 .rce. gvfs-fuse-daemo
                     cmiller 2719 Frce. gsd-printer
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                     cmiller 2737 Frce. gvfsd-metadata
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                     cmiller 2760 Frce. deluge-web
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                     cmiller 2770 .rce. gvfsd-burn
                     cmiller 2772 .rce. gvfs-gphoto2-vo
                     cmiller 2782 .rce. gvfs-afc-volume
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                     cmiller 2835 Frce. deluged
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                     cmiller 3032 Frce. sh
                     cmiller 3033 Frce. unity-window-de
                     cmiller 3036 .rce. unity-panel-ser
                     cmiller 3040 frce. bamfdaemon
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                     cmiller 3134 Frce. applet.py
                     cmiller 3135 Frce. gwibber-service
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                     cmiller 3172 Frce. ubuntuone-syncd
                     cmiller 3174 Frce. gwibber-service
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                     cmiller 3176 Frce. gwibber-service
                     cmiller 3177 Frce. gwibber-service
                     cmiller 3208 Frce. update-notifier
                     cmiller 3227 Frce. update-manager
                     cmiller 3346 .rce. unity-files-dae
                     cmiller 3348 Frce. unity-music-dae
                     cmiller 3350 frce. unity-applicati
                     cmiller 3386 .rce. unity-musicstor
                     cmiller 12832 frce. oneconf-service
                     cmiller 13079 .rce. bash
                     cmiller 27275 .rce. indicator-sound
                     cmiller 27282 Frce. pulseaudio
                     cmiller 27285 .rce. gconf-helper
                     cmiller 27715 Frce. sh
                     cmiller 27716 Frce. gnome-terminal
                     cmiller 27721 .rce. bash
                     cmiller 27728 .rce. ssh