Arvados

When installing python3-certbot from stretch-backports, which depends in python3-future along with python-arvados-python-client, apt fails with

dpkg: error processing archive /var/cache/apt/archives/python3-future_0.16.0-2_all.deb (--unpack):
 trying to overwrite '/usr/bin/futurize', which is also in package python-future 0.16.0-2

The issue is that

• python-arvados-python-client depends on python-future
• python3-certbot depends on python3-future
• Our packages python-future and python3-future have precedence over the distro ones, due to apt-preferences
• Our packages have invalid content and do not differentiate between versions.

While the distro's packages have:

• python-future contents:
  

  ...
  ./usr/bin/python2-futurize
  ./usr/bin/python2-pasteurize
  ...
  ./usr/lib/python2.7/dist-packages/
  ...
  

• python3-future contents:
  

  ...
  ./usr/bin/python3-futurize
  ./usr/bin/python3-pasteurize
  ...
  ./usr/lib/python3/dist-packages
  ...
  

The Arvados' repo packages have

• python-future contents:
  

  ...
  ./usr/bin/futurize
  ./usr/bin/pasteurize
  ...
  ./usr/lib/python2.7/dist-packages
  

• python3-future contents:
  

  ...
  ./usr/bin/futurize
  ./usr/bin/pasteurize
  ...
  ./usr/lib/python3.5/dist-packages
  ...