Minimal test case, unpacking python3-minimal and python3-apt from artful on xenial:
root@lp1768379:~# dpkg --unpack /home/jak/Downloads/python3-minimal_3.6.3-0ubuntu2_amd64.deb (Reading database ... 25653 files and directories currently installed.) Preparing to unpack .../python3-minimal_3.6.3-0ubuntu2_amd64.deb ... Unpacking python3-minimal (3.6.3-0ubuntu2) over (3.5.1-3) ... Processing triggers for man-db (2.7.5-1) ... root@lp1768379:~# dpkg --unpack /home/jak/Downloads/python3-apt_1.4.0_beta3build2_amd64.deb (Reading database ... 25653 files and directories currently installed.) Preparing to unpack .../python3-apt_1.4.0_beta3build2_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 /home/jak/Downloads/python3-apt_1.4.0_beta3build2_amd64.deb (--unpack): subprocess new pre-removal script returned error exit status 127 /var/lib/dpkg/info/python3-apt.postinst: 6: /var/lib/dpkg/info/python3-apt.postinst: py3compile: not found dpkg: error while cleaning up: subprocess installed post-installation script returned error exit status 127 Errors were encountered while processing: /home/jak/Downloads/python3-apt_1.4.0_beta3build2_amd64.deb -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1768379 Title: failed 16.04 LTS -> 18.04 LTS upgrade To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/python3-defaults/+bug/1768379/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
