package redmine 3.3.1-4+deb9u1build0.17.10.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[darg elf]

just did a do-release-update
stopped here

Processing triggers for libc-bin (2.27-3ubuntu1) ...

Progress: [ 91%]
Errors were encountered while processing:
 redmine
Exception during pm.DoInstall(): E:Sub-process /usr/bin/dpkg returned an error code (1)

ProblemType: Package
DistroRelease: Ubuntu 17.10
Package: redmine 3.3.1-4+deb9u1build0.17.10.1
ProcVersionSignature: Ubuntu 4.13.0-39.44-generic 4.13.16
Uname: Linux 4.13.0-39-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.9
Architecture: amd64
Date: Tue Aug 28 07:45:08 2018
ErrorMessage: subprocess installed post-installation script returned error exit status 1
PackageArchitecture: all
Python3Details: /usr/bin/python3.6, Python 3.6.3, python3-minimal, 3.6.3-0ubuntu3
PythonDetails: /tmp/ubuntu-release-upgrader-4bcfcf78/Error: command ['which', 'python'] failed with exit code 1:, Error: [Errno 2] No such file or directory: "/tmp/ubuntu-release-upgrader-4bcfcf78/Error: command ['which', 'python'] failed with exit code 1:": "/tmp/ubuntu-release-upgrader-4bcfcf78/Error: command ['which', 'python'] failed with exit code 1:", unpackaged
RelatedPackageVersions:
 dpkg 1.18.24ubuntu1
 apt 1.5.2
SourcePackage: redmine
Title: package redmine 3.3.1-4+deb9u1build0.17.10.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to artful on 2018-08-28 (0 days ago)