package gnuplot-mode (removed after failure) failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Mario Frasca]

I have a locally modified version of gnuplot-mode,
the error happened while doing the do-release-upgrade.

ProblemType: Package
DistroRelease: Ubuntu 14.10
Package: gnuplot-mode (not installed)
ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4
Uname: Linux 3.16.0-24-generic i686
ApportVersion: 2.14.7-0ubuntu8
Architecture: i386
Date: Sun Nov 16 03:27:11 2014
DuplicateSignature: package:gnuplot-mode:(not installed):subprocess installed post-installation script returned error exit status 1
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2013-02-21 (632 days ago)
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
SourcePackage: gnuplot-mode
Title: package gnuplot-mode (not installed) failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to utopic on 2014-11-16 (0 days ago)