Setting up python3-minimal (3.6.2-1ubuntu1) ...
Traceback (most recent call last):
  File "/usr/bin/py3compile", line 34, in <module>
    from debpython.version import SUPPORTED, debsorted, vrepr, \
  File "/usr/share/python3/debpython/version.py", line 46, in <module>
    _config.read('/usr/share/python3/debian_defaults')
  File "/usr/lib/python3.6/configparser.py", line 697, in read
    self._read(fp, filename)
  File "/usr/lib/python3.6/configparser.py", line 1092, in _read
    fpname, lineno)
configparser.DuplicateOptionError: While reading from '/usr/share/python3/debian_defaults' [line 10]: option 'old-versions' in section 'DEFAULT' already exists
dpkg: error processing package python3-minimal (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 python3-minimal
E: Sub-process /usr/bin/dpkg returned an error code (1)