package upstart 1.5-0ubuntu7.2 failed to install/upgrade: unable to install new version of `/sbin/init': Device or resource busy

[Ezequiel Valenzuela]

In ubuntu-12.04 (xubuntu, amd64), upstart fails to upgrade. I haven't analysed the problem to get to the root cause.

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: upstart 1.5-0ubuntu7.2
ProcVersionSignature: Ubuntu 3.2.0-83.120-generic 3.2.68
Uname: Linux 3.2.0-83-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.10
AptOrdering:
 upstart: Install
 upstart: Configure
Architecture: amd64
Date: Sat Sep 26 16:40:25 2015
DpkgTerminalLog:
 Preparing to replace upstart 1.5-0ubuntu7.2 (using .../upstart_1.5-0ubuntu7.3_amd64.deb) ...
 Unpacking replacement upstart ...
 dpkg: error processing /var/cache/apt/archives/upstart_1.5-0ubuntu7.3_amd64.deb (--unpack):
  unable to install new version of `/sbin/init': Device or resource busy
DuplicateSignature: package:upstart:1.5-0ubuntu7.2:unable to install new version of `/sbin/init': Device or resource busy
ErrorMessage: unable to install new version of `/sbin/init': Device or resource busy
InstallationMedia: Xubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120822.1)
MarkForUpload: True
SourcePackage: upstart
Title: package upstart 1.5-0ubuntu7.2 failed to install/upgrade: unable to install new version of `/sbin/init': Device or resource busy
UpgradeStatus: No upgrade log present (probably fresh install)