package mailman3-web 0+20200530-2 failed to install/upgrade: installed mailman3-web package post-installation script subprocess returned error exit status 1

[Mark Nagel]

This occurred during do-release-upgrade (in progress). Details still fuzzy.

ProblemType: Package
DistroRelease: Ubuntu 22.04
Package: mailman3-web 0+20200530-2
ProcVersionSignature: Ubuntu 5.4.0-164.181-generic 5.4.248
Uname: Linux 5.4.0-164-generic x86_64
ApportVersion: 2.20.11-0ubuntu82.5
Architecture: amd64
CasperMD5CheckResult: unknown
CloudArchitecture: x86_64
CloudID: nocloud
CloudName: unknown
CloudPlatform: nocloud
CloudSubPlatform: seed-dir (/var/lib/cloud/seed/nocloud-net)
Date: Sat Oct 7 18:02:55 2023
ErrorMessage: installed mailman3-web package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2020-02-19 (1325 days ago)
InstallationMedia: Ubuntu-Server 18.04.4 LTS "Bionic Beaver" - Release amd64 (20200203.1)
PackageArchitecture: all
Python3Details: /usr/bin/python3.10, Python 3.10.12, python3-minimal, 3.10.6-1~22.04
PythonDetails: /usr/bin/python2.7, Python 2.7.18, python-is-python2, 2.7.17-4
RebootRequiredPkgs: Error: path contained symlinks.
RelatedPackageVersions:
 dpkg 1.21.1ubuntu2.2
 apt 2.4.10
SourcePackage: mailman-suite
Title: package mailman3-web 0+20200530-2 failed to install/upgrade: installed mailman3-web package post-installation script subprocess returned error exit status 1
UpgradeStatus: Upgraded to jammy on 2023-10-07 (0 days ago)
mtime.conffile..etc.mailman3.nginx.conf: 2023-06-14T20:56:28.675097

[Mark Nagel (ciscoqid)]

I appear to have resolved this as follows:

/etc/mailman3/mailman-web.py:

Appended:

DEFAULT_AUTO_FIELD = 'django.db.models.AutoField'
COMPRESS_OFFLINE = True

/usr/share/mailman3-web/settings.py

Changed:

Q_CLUSTER = {
    'timeout': 300,
    'save_limit': 100,
    'orm': 'default',
    'poll': 5,
}

To:

Q_CLUSTER = {
    'timeout': 30,
    'save_limit': 100,
    'orm': 'default',
    'poll': 5,
}

That last one I am not sure was the best option, but it resolved the timeout/retry value check problem.