mountall fails to upgrade in an lxc container

[James Hunt]

Preparing to replace mountall 2.31 (using .../mountall_2.33_i386.deb) ...
Unpacking replacement mountall ...
dpkg: error processing /var/cache/apt/archives/mountall_2.33_i386.deb (--unpack):
 unable to make backup link of `./lib/init/fstab' before installing new version: Invalid cross-device link
Preparing to replace sysv-rc 2.88dsf-13.10ubuntu8 (using .../sysv-rc_2.88dsf-13.10ubuntu9_i386.deb) ...

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: mountall 2.33
ProcVersionSignature: Ubuntu 3.2.0-12.21-generic-pae 3.2.2
Uname: Linux 3.2.0-12-generic-pae i686
NonfreeKernelModules: nvidia
ApportVersion: 1.91-0ubuntu1
Architecture: i386
Date: Mon Feb 6 09:42:18 2012
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
ProcEnviron:
 PATH=(custom, user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: mountall
UpgradeStatus: Upgraded to precise on 2012-01-12 (24 days ago)
modified.conffile..etc.init.mountall.conf: [modified]
mtime.conffile..etc.init.mountall.conf: 2011-04-28T15:57:05.250793

[James Hunt (jamesodhunt)]

As alluded to on bug 892892, work around is:

$ sudo umount /lib/init/fstab
$ sudo apt-get install --reinstall mountall