>From the log file:

Preparing to unpack .../python3-apt_1.6.0~rc2ubuntu2_amd64.deb ...
/var/lib/dpkg/info/python3-apt.prerm: 6: /var/lib/dpkg/info/python3-apt.prerm: 
py3clean: not found
dpkg: warning: subprocess old pre-removal script returned error exit status 127
dpkg: trying script from the new package instead ...
/var/lib/dpkg/tmp.ci/prerm: 6: /var/lib/dpkg/tmp.ci/prerm: py3clean: not found
dpkg: error processing archive 
/var/cache/apt/archives/python3-apt_1.6.0~rc2ubuntu2_amd64.deb (--unpack):
 subprocess new pre-removal script returned error exit status 127

Does the file /usr/bin/py3clean exist on your system?

** Changed in: software-properties (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1763822

Title:
  package software-properties-common 0.96.24.28 failed to
  install/upgrade: subprocess new pre-removal script returned error exit
  status 127

Status in software-properties package in Ubuntu:
  Incomplete

Bug description:
  Package crash after log in

  ProblemType: Package
  DistroRelease: Ubuntu 18.04
  Package: software-properties-common 0.96.24.28
  ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
  Uname: Linux 4.15.0-13-generic x86_64
  ApportVersion: 2.20.9-0ubuntu4
  Architecture: amd64
  Date: Fri Apr 13 17:34:14 2018
  ErrorMessage: subprocess new pre-removal script returned error exit status 127
  InstallationDate: Installed on 2017-04-13 (364 days ago)
  InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 
(20170215.2)
  PackageArchitecture: all
  Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-2
  PythonDetails: /usr/bin/python2.7, Python 2.7.14+, python-minimal, 2.7.14-4
  RelatedPackageVersions:
   dpkg 1.19.0.5ubuntu1
   apt  1.6~beta1
  SourcePackage: software-properties
  Title: package software-properties-common 0.96.24.28 failed to 
install/upgrade: subprocess new pre-removal script returned error exit status 
127
  UpgradeStatus: Upgraded to bionic on 2018-04-13 (0 days ago)

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