Preparing to unpack .../libapt-inst2.0_1.2.31_amd64.deb ...
Unpacking libapt-inst2.0:amd64 (1.2.31) over (1.2.26) ...
Preparing to unpack .../python-apt-common_1.1.0~beta1ubuntu0.16.04.2_all.deb ...
Unpacking python-apt-common (1.1.0~beta1ubuntu0.16.04.2) over (1.1.0~beta1ubuntu0.16.04.1) ...
Preparing to unpack .../python3-apt_1.1.0~beta1ubuntu0.16.04.2_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_1.1.0~beta1ubuntu0.16.04.2_amd64.deb (--unpack):
 subprocess new pre-removal script returned error exit status 127