ntop fails to upgrade if eth0 is down

[sonicgrass]

 * ntop: interface eth0 is down
invoke-rc.d: initscript ntop, action "start" failed.
dpkg: error processing ntop (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 ntop
E: Sub-process /usr/bin/dpkg returned an error code (1)

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: ntop 3:4.1.0+dfsg1-1
ProcVersionSignature: Ubuntu 3.0.0-19.33-generic-pae 3.0.27
Uname: Linux 3.0.0-19-generic-pae i686
ApportVersion: 2.0.1-0ubuntu7
AptOrdering: ntop: Configure
Architecture: i386
Date: Sun May 13 13:02:11 2012
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
SourcePackage: ntop
Title: package ntop 3:4.1.0+dfsg1-1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to precise on 2012-05-12 (0 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.