tried to install unity8-desktop-session-mir

[Luca Weiss]

Setting up click (0.4.39.1+15.10.20150702-0ubuntu2) ...
Traceback (most recent call last):
  File "/usr/bin/click", line 31, in <module>
    from click import commands
ImportError: cannot import name 'commands'

ProblemType: Package
DistroRelease: Ubuntu 15.10
Package: click 0.4.39.1+15.10.20150702-0ubuntu2
ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
Uname: Linux 4.2.0-16-generic x86_64
ApportVersion: 2.19.1-0ubuntu4
Architecture: amd64
Date: Thu Oct 29 12:40:06 2015
DuplicateSignature: package:click:0.4.39.1+15.10.20150702-0ubuntu2:subprocess installed post-installation script returned error exit status 1
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2015-06-10 (140 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
RelatedPackageVersions:
 dpkg 1.18.2ubuntu5
 apt 1.0.10.2ubuntu1
SourcePackage: click
Title: package click 0.4.39.1+15.10.20150702-0ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to wily on 2015-10-22 (6 days ago)