Bug#915252: directory '/usr/lib/python3.6' not empty so not removed

[積丹尼 Dan Jacobson]

# set python3-distutils python3-libto2to3
# apt-cache policy $@
python3-distutils:
  Installed: (none)
  Candidate: 3.7.1-1
  Version table:
     3.7.1-1 500
        500 http://opensource.nchc.org.tw/debian unstable/main i386 Packages
N: Unable to locate package python3-libto2to3

Some package is not doing its job of cleaning up after itself.

It is a bug to make dpkg make error messages.