python3-networkx and python-networkx ship conflicting files in /usr/share/doc/python-networkx

[mugwort_rc]

$ lsb_release -rd
Description: Ubuntu 14.04.2 LTS
Release: 14.04

$ apt-cache policy python-networkx
python-networkx:
  Installed: 1.8.1-0ubuntu3
  Candidate: 1.8.1-0ubuntu3
  Version table:
 *** 1.8.1-0ubuntu3 0
        500 http://jp.archive.ubuntu.com/ubuntu/ trusty/main i386 Packages
        100 /var/lib/dpkg/status

$ apt-cache policy python3-networkx
python3-networkx:
  Installed: (none)
  Candidate: 1.8.1-0ubuntu3
  Version table:
     1.8.1-0ubuntu3 0
        500 http://jp.archive.ubuntu.com/ubuntu/ trusty/universe i386 Packages

$ sudo apt-get install python3-networkx
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
  python3-networkx
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/506 kB of archives.
After this operation, 2862 kB of additional disk space will be used.
(Reading database ... 485624 files and directories currently installed.)
Preparing to unpack .../python3-networkx_1.8.1-0ubuntu3_all.deb ...
Unpacking python3-networkx (1.8.1-0ubuntu3) ...
dpkg: error processing archive /var/cache/apt/archives/python3-networkx_1.8.1-0ubuntu3_all.deb (--unpack):
 trying to overwrite '/usr/share/doc/python-networkx/examples/basic/read_write.py', which is also in package python-networkx 1.8.1-0ubuntu3
dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
Errors were encountered while processing:
 /var/cache/apt/archives/python3-networkx_1.8.1-0ubuntu3_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: python3-networkx (not installed)
ProcVersionSignature: Ubuntu 3.13.0-39.66-generic 3.13.11.8
Uname: Linux 3.13.0-39-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.11
AptOrdering:
 python-networkx: Install
 python3-networkx: Install
 python-networkx: Configure
 python3-networkx: Configure
Architecture: i386
Date: Sun Jun 7 14:49:49 2015
DuplicateSignature: package:python3-networkx:(not installed):'/usr/share/doc/python-networkx/examples/basic/read_write.py' を上書きしようとしています。これはパッケージ python-networkx 1.8.1-0ubuntu3 にも存在します
ErrorMessage: '/usr/share/doc/python-networkx/examples/basic/read_write.py' を上書きしようとしています。これはパッケージ python-networkx 1.8.1-0ubuntu3 にも存在します
SourcePackage: python-networkx
Title: package python3-networkx (not installed) failed to install/upgrade: '/usr/share/doc/python-networkx/examples/basic/read_write.py' を上書きしようとしています。これはパッケージ python-networkx 1.8.1-0ubuntu3 にも存在します
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.