package edubuntu-artwork 15.12.1 failed to install/upgrade: subprocess installed post-removal script returned error exit status 127

[Anil Kumar]

when I want to install any thing following information shown by terminal

(Reading database ... 147460 files and directories currently installed.)
Removing edubuntu-artwork (15.12.1) ...
/var/lib/dpkg/info/edubuntu-artwork.postrm: 31: /var/lib/dpkg/info/edubuntu-artwork.postrm: update-gconf-defaults: not found
dpkg: error processing package edubuntu-artwork (--remove):
 subprocess installed post-removal script returned error exit status 127
Errors were encountered while processing:
 edubuntu-artwork
E: Sub-process /usr/bin/dpkg returned an error code (1)

ProblemType: Package
DistroRelease: Ubuntu 17.10
Package: edubuntu-artwork 15.12.1
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.1
Architecture: amd64
Date: Thu Nov 16 03:25:08 2017
DpkgTerminalLog:
 Removing edubuntu-artwork (15.12.1) ...
 /var/lib/dpkg/info/edubuntu-artwork.postrm: 31: /var/lib/dpkg/info/edubuntu-artwork.postrm: update-gconf-defaults: not found
 dpkg: error processing package edubuntu-artwork (--remove):
  subprocess installed post-removal script returned error exit status 127
DuplicateSignature:
 package:edubuntu-artwork:15.12.1
 Removing edubuntu-artwork (15.12.1) ...
 /var/lib/dpkg/info/edubuntu-artwork.postrm: 31: /var/lib/dpkg/info/edubuntu-artwork.postrm: update-gconf-defaults: not found
 dpkg: error processing package edubuntu-artwork (--remove):
  subprocess installed post-removal script returned error exit status 127
ErrorMessage: subprocess installed post-removal script returned error exit status 127
InstallationDate: Installed on 2017-11-15 (0 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
PackageArchitecture: all
Python3Details: /usr/bin/python3.6, Python 3.6.3, python3-minimal, 3.6.3-0ubuntu2
PythonDetails: /root/Error: command ['which', 'python'] failed with exit code 1:, Error: [Errno 2] No such file or directory: "/root/Error: command ['which', 'python'] failed with exit code 1:": "/root/Error: command ['which', 'python'] failed with exit code 1:", unpackaged
RelatedPackageVersions:
 dpkg 1.18.24ubuntu1
 apt 1.5.1
SourcePackage: edubuntu-artwork
Title: package edubuntu-artwork 15.12.1 failed to install/upgrade: subprocess installed post-removal script returned error exit status 127
UpgradeStatus: Upgraded to artful on 2017-11-15 (0 days ago)

[Launchpad Janitor (janitor)]

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

[Norbert (nrbrtx)]

Just got this issue on Focal:

```
Setting up edubuntu-artwork (15.12.1) ...
/var/lib/dpkg/info/edubuntu-artwork.postinst: 18: update-gconf-defaults: not found
dpkg: error processing package edubuntu-artwork (--configure):
 installed edubuntu-artwork package post-installation script subprocess returned error exit status 127
Errors were encountered while processing:
 edubuntu-artwork
E: Sub-process /usr/bin/dpkg returned an error code (1)

```

This package should depend on `gconf2` package if it really uses it.