package fail2ban 0.10.2-2 failed to install/upgrade: installed fail2ban package post-installation script subprocess returned error exit status 1

[sam tygier]

fail2ban fails to install with the error

Setting up fail2ban (0.10.2-2) ...
  File "/usr/lib/python3/dist-packages/fail2ban/client/fail2banclient.py", line 231
    def configureServer(self, async=True, phase=None):
                                  ^
SyntaxError: invalid syntax

  File "/usr/lib/python3/dist-packages/fail2ban/client/fail2banserver.py", line 173
    async = self._conf.get("async", False)
          ^
SyntaxError: invalid syntax

dpkg: error processing package fail2ban (--configure):
 installed fail2ban package post-installation script subprocess returned error exit status 1

ProblemType: Package
DistroRelease: Ubuntu 18.10
Package: fail2ban 0.10.2-2
ProcVersionSignature: Ubuntu 4.18.0-7.8-generic 4.18.5
Uname: Linux 4.18.0-7-generic x86_64
ApportVersion: 2.20.10-0ubuntu11
AptOrdering:
 fail2ban:amd64: Install
 python3-pyinotify:amd64: Install
 whois:amd64: Install
 NULL: ConfigurePending
Architecture: amd64
Date: Tue Sep 25 13:02:03 2018
ErrorMessage: installed fail2ban package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2018-07-04 (82 days ago)
InstallationMedia: Ubuntu-MATE 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
PackageArchitecture: all
Python3Details: /usr/bin/python3.6, Python 3.6.6+, python3-minimal, 3.6.6-1
PythonDetails: /usr/bin/python2.7, Python 2.7.15+, python-minimal, 2.7.15-3
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu5
 apt 1.7.0~rc2
SourcePackage: fail2ban
Title: package fail2ban 0.10.2-2 failed to install/upgrade: installed fail2ban package post-installation script subprocess returned error exit status 1
UpgradeStatus: Upgraded to cosmic on 2018-09-10 (14 days ago)

[sam tygier (samtygier)]

async became a keyword in python 3.7. This looks like the upstream fix:

https://github.com/fail2ban/fail2ban/commit/ac9d5f61e7e9151f7518c26db192dd6d0bf56591