$ sudo dpkg -i python3_3.7.3-1_amd64.deb
Selecting previously unselected package python3.
dpkg: warning: files list file for package 'python3-setuptools' missing; assuming package has no files currently installed
dpkg: warning: files list file for package 'libcpg4:amd64' missing; assuming package has no files currently installed
dpkg: warning: files list file for package 'python3-zope.event' missing; assuming package has no files currently installed
dpkg: warning: files list file for package 'python3-pbr' missing; assuming package has no files currently installed
dpkg: warning: files list file for package 'libquorum5:amd64' missing; assuming package has no files currently installed
dpkg: warning: files list file for package 'python3-zope.component' missing; assuming package has no files currently installed
dpkg: warning: files list file for package 'libnl-route-3-200:amd64' missing; assuming package has no files currently installed
dpkg: warning: files list file for package 'libpve-apiclient-perl' missing; assuming package has no files currently installed
dpkg: warning: files list file for package 'libknet1:amd64' missing; assuming package has no files currently installed
dpkg: warning: files list file for package 'libsndfile1:amd64' missing; assuming package has no files currently installed
dpkg: warning: files list file for package 'libvorbisenc2:amd64' missing; assuming package has no files currently installed
(Reading database ... 106482 files and directories currently installed.)
Preparing to unpack python3_3.7.3-1_amd64.deb ...
/var/lib/dpkg/info/python3.prerm: 5: /var/lib/dpkg/info/python3.prerm: py3clean: Exec format error
dpkg: warning: old python3 package pre-removal script subprocess returned error exit status 2
dpkg: trying script from the new package instead ...
/var/lib/dpkg/tmp.ci/prerm: 5: /var/lib/dpkg/tmp.ci/prerm: py3clean: Exec format error
dpkg: error processing archive python3_3.7.3-1_amd64.deb (--install):
 new python3 package pre-removal script subprocess returned error exit status 2
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/python3.7/configparser.py", line 696, in read
    self._read(fp, filename)
  File "/usr/lib/python3.7/configparser.py", line 1014, in _read
    for lineno, line in enumerate(fp, start=1):
  File "/usr/lib/python3.7/codecs.py", line 322, in decode
    (result, consumed) = self._buffer_decode(data, self.errors, final)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x95 in position 1: invalid start byte
dpkg: error while cleaning up:
 installed python3 package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
 python3_3.7.3-1_amd64.deb