package python-six 1.10.0-3 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Gary Crothers]

attempting "sudo apt-get install python-matplotlib" with Python 3.5 as my default Python version

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: python-six 1.10.0-3
ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15
Uname: Linux 4.4.0-34-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
Date: Tue Aug 16 15:47:58 2016
Dependencies:

ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2016-08-08 (8 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
PackageArchitecture: all
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt 1.2.12~ubuntu16.04.1
SourcePackage: six
Title: package python-six 1.10.0-3 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

[Barry Warsaw (barry)]

Hi, in your description you say Python 3.5 is your default Python. Does that mean you changed what /usr/bin/python points to? If so, that is not a supported configuration on Ubuntu and it's not surprising that the installation failed. You should use /usr/bin/python3 for all your Python 3 needs.

[Launchpad Janitor (janitor)]

[Expired for six (Ubuntu) because there has been no activity for 60 days.]