Error upgrading on Debian 9 from Installed: 1:2.1.23-1+deb9u6 to Candidate: 1:2.1.23-1+deb9u7

[g]

Debian 9
Upgrading mailman
  Installed: 1:2.1.23-1+deb9u6
  Candidate: 1:2.1.23-1+deb9u7

apt update
apt upgrade

errors
Fetched 6,748 kB in 0s (12.4 MB/s)
Reading changelogs... Done
Preconfiguring packages ...
  File "/var/lib/mailman/bin/list_lists", line 75
    except getopt.error, msg:
                       ^
SyntaxError: invalid syntax
(Reading database ... 99804 files and directories currently installed.)
Preparing to unpack .../00-mailman_1%3a2.1.23-1+deb9u7_amd64.deb ...
  File "/usr/bin/pyclean", line 63
    except (IOError, OSError), e:
                             ^
SyntaxError: invalid syntax
dpkg: warning: subprocess old pre-removal script returned error exit status 1
dpkg: trying script from the new package instead ...
  File "/usr/bin/pyclean", line 63
    except (IOError, OSError), e:
                             ^
SyntaxError: invalid syntax
dpkg: error processing archive /tmp/apt-dpkg-install-vEhtzR/00-mailman_1%3a2.1.23-1+deb9u7_amd64.deb (--unpack):
 subprocess new pre-removal script returned error exit status 1
  File "/var/lib/mailman/bin/list_lists", line 75
    except getopt.error, msg:
                       ^
SyntaxError: invalid syntax
  File "/usr/lib/mailman/bin/update", line 107
    print C_('Fixing language templates: %(listname)s')
          ^
SyntaxError: invalid syntax
dpkg: error while cleaning up:
 subprocess installed post-installation script returned error exit status 1
Preparing to unpack .../01-python-pil_4.0.0-4+deb9u3_amd64.deb ...
  File "/usr/bin/pyclean", line 63
    except (IOError, OSError), e:
                             ^
SyntaxError: invalid syntax
dpkg: warning: subprocess old pre-removal script returned error exit status 1
dpkg: trying script from the new package instead ...
  File "/usr/bin/pyclean", line 63
    except (IOError, OSError), e:
                             ^
SyntaxError: invalid syntax
dpkg: error processing archive /tmp/apt-dpkg-install-vEhtzR/01-python-pil_4.0.0-4+deb9u3_amd64.deb (--unpack):
 subprocess new pre-removal script returned error exit status 1
Traceback (most recent call last):
  File "/usr/bin/pycompile", line 35, in <module>
    from debpython.version import SUPPORTED, debsorted, vrepr, \
  File "/usr/share/python/debpython/version.py", line 24, in <module>
    from ConfigParser import SafeConfigParser
ModuleNotFoundError: No module named 'ConfigParser'
dpkg: error while cleaning up:
 subprocess installed post-installation script returned error exit status 1
Preparing to unpack .../02-python-imaging_4.0.0-4+deb9u3_all.deb ...
  File "/usr/bin/pyclean", line 63
    except (IOError, OSError), e:
                             ^
SyntaxError: invalid syntax
dpkg: warning: subprocess old pre-removal script returned error exit status 1
dpkg: trying script from the new package instead ...
  File "/usr/bin/pyclean", line 63
    except (IOError, OSError), e:
                             ^
SyntaxError: invalid syntax
dpkg: error processing archive /tmp/apt-dpkg-install-vEhtzR/02-python-imaging_4.0.0-4+deb9u3_all.deb (--unpack):
 subprocess new pre-removal script returned error exit status 1
Traceback (most recent call last):
  File "/usr/bin/pycompile", line 35, in <module>
    from debpython.version import SUPPORTED, debsorted, vrepr, \
  File "/usr/share/python/debpython/version.py", line 24, in <module>
    from ConfigParser import SafeConfigParser
ModuleNotFoundError: No module named 'ConfigParser'
dpkg: error while cleaning up:
 subprocess installed post-installation script returned error exit status 1
Preparing to unpack .../03-python-lxml_3.7.1-1+deb9u4_amd64.deb ...
  File "/usr/bin/pyclean", line 63
    except (IOError, OSError), e:
                             ^
SyntaxError: invalid syntax
dpkg: warning: subprocess old pre-removal script returned error exit status 1
dpkg: trying script from the new package instead ...
  File "/usr/bin/pyclean", line 63
    except (IOError, OSError), e:
                             ^
SyntaxError: invalid syntax
dpkg: error processing archive /tmp/apt-dpkg-install-vEhtzR/03-python-lxml_3.7.1-1+deb9u4_amd64.deb (--unpack):
 subprocess new pre-removal script returned error exit status 1
Traceback (most recent call last):
  File "/usr/bin/pycompile", line 35, in <module>
    from debpython.version import SUPPORTED, debsorted, vrepr, \
  File "/usr/share/python/debpython/version.py", line 24, in <module>
    from ConfigParser import SafeConfigParser
ModuleNotFoundError: No module named 'ConfigParser'
dpkg: error while cleaning up:
 subprocess installed post-installation script returned error exit status 1
Preparing to unpack .../04-python-xdg_0.25-4+deb9u1_all.deb ...
  File "/usr/bin/pyclean", line 63
    except (IOError, OSError), e:
                             ^
SyntaxError: invalid syntax
dpkg: warning: subprocess old pre-removal script returned error exit status 1
dpkg: trying script from the new package instead ...
  File "/usr/bin/pyclean", line 63
    except (IOError, OSError), e:
                             ^
SyntaxError: invalid syntax
dpkg: error processing archive /tmp/apt-dpkg-install-vEhtzR/04-python-xdg_0.25-4+deb9u1_all.deb (--unpack):
 subprocess new pre-removal script returned error exit status 1
Traceback (most recent call last):
  File "/usr/bin/pycompile", line 35, in <module>
    from debpython.version import SUPPORTED, debsorted, vrepr, \
  File "/usr/share/python/debpython/version.py", line 24, in <module>
    from ConfigParser import SafeConfigParser
ModuleNotFoundError: No module named 'ConfigParser'
dpkg: error while cleaning up:
 subprocess installed post-installation script returned error exit status 1

Errors were encountered while processing:
 /tmp/apt-dpkg-install-vEhtzR/00-mailman_1%3a2.1.23-1+deb9u7_amd64.deb
 /tmp/apt-dpkg-install-vEhtzR/01-python-pil_4.0.0-4+deb9u3_amd64.deb
 /tmp/apt-dpkg-install-vEhtzR/02-python-imaging_4.0.0-4+deb9u3_all.deb
 /tmp/apt-dpkg-install-vEhtzR/03-python-lxml_3.7.1-1+deb9u4_amd64.deb
 /tmp/apt-dpkg-install-vEhtzR/04-python-xdg_0.25-4+deb9u1_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

Thanks

[Mark Sapiro (msapiro)]

This is not the place to report Debian packaging issues. Try https://www.debian.org/Bugs/