package doc-base 0.10.8 failed to install/upgrade: installed doc-base package post-installation script subprocess returned error exit status 10

[Holger Voss]

upgrade-installation from 16.04 to 18.04 failed at this point

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: doc-base 0.10.8
ProcVersionSignature: Ubuntu 4.4.0-122.146-generic 4.4.117
Uname: Linux 4.4.0-122-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
Date: Sun Apr 29 15:08:51 2018
ErrorMessage: installed doc-base package post-installation script subprocess returned error exit status 10
InstallationDate: Installed on 2013-08-03 (1730 days ago)
InstallationMedia: Ubuntu-GNOME 13.04 "Raring Ringtail" - Release amd64 (20130424)
PackageArchitecture: all
Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2
 apt 1.6.1
SourcePackage: doc-base
Title: package doc-base 0.10.8 failed to install/upgrade: installed doc-base package post-installation script subprocess returned error exit status 10
UpgradeStatus: Upgraded to bionic on 2018-04-29 (0 days ago)

[Launchpad Janitor (janitor)]

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

[erwan KRUG (erwank)]

Happened just during an upgrade from 16.04 to 18.04 BECAUSE I FAILED AN ANSWER TO ACCEPT A CHANGE OF A 'CONFIG FILE' -likish request and pressed Enter, that is, to default keep the old config instead of changing to the new version.

[erwan KRUG (erwank)]

It was something like: "doc-base: This file has to be changed to a newer version ... ..., would you like to change to the new version or keep the old one?" with a default on keep. I read too quickly and chose keep with a compulsive ENTER hit. My Bad. Any one remembers the file name ?