package miredo 1.2.6-3 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

Installed miredo via Package Manager, and I got this report.

Afterwards ifconfig does show a teredo interface (with 2001:0:... address), but it's not working:

$ ping6 www.google.com
connect: Network is unreachable

Restarting the miredo service does not solve that.

ProblemType: Package
DistroRelease: Ubuntu 15.10
Package: miredo 1.2.6-3
ProcVersionSignature: Ubuntu 4.2.0-22.27-generic 4.2.6
Uname: Linux 4.2.0-22-generic x86_64
ApportVersion: 2.19.1-0ubuntu5
AptOrdering:
 libjudydebian1: Install
 miredo: Install
 libjudydebian1: Configure
 miredo: Configure
 NULL: ConfigurePending
Architecture: amd64
Date: Wed Dec 23 20:33:24 2015
DuplicateSignature: package:miredo:1.2.6-3:subprocess installed post-installation script returned error exit status 1
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2015-12-23 (0 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
RelatedPackageVersions:
 dpkg 1.18.2ubuntu5.1
 apt 1.0.10.2ubuntu1
SourcePackage: miredo
Title: package miredo 1.2.6-3 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)