package python-pip-whl 1.5.6-7ubuntu2 failed to install/upgrade: trying to overwrite '/usr/share/python-wheels/html5lib-0.999-py2.py3-none-any.whl', which is also in package python-html5lib-whl 0.999-3build1

upgrade today produced this.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: python-pip-whl 1.5.6-7ubuntu2
ProcVersionSignature: Ubuntu 4.4.0-2.16-generic 4.4.0
Uname: Linux 4.4.0-2-generic x86_64
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
ApportVersion: 2.20-0ubuntu3
Architecture: amd64
Date: Wed Feb 24 19:47:18 2016
Dependencies:
 python-chardet-whl 2.3.0-1build1 [origin: unknown]
 python-html5lib-whl 0.999-3build1 [origin: unknown]
 python3-pkg-resources 20.1.1-1
EcryptfsInUse: Yes
ErrorMessage: trying to overwrite '/usr/share/python-wheels/html5lib-0.999-py2.py3-none-any.whl', which is also in package python-html5lib-whl 0.999-3build1
InstallationDate: Installed on 2015-07-23 (217 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150722.1)
PackageArchitecture: all
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1
 apt 1.2.3
SourcePackage: python-pip
Title: package python-pip-whl 1.5.6-7ubuntu2 failed to install/upgrade: trying to overwrite '/usr/share/python-wheels/html5lib-0.999-py2.py3-none-any.whl', which is also in package python-html5lib-whl 0.999-3build1
UpgradeStatus: No upgrade log present (probably fresh install)