To verify this I actually had to edit my sources.list from xenial to artful so I could first install python3.6-minimal which depended on libc6 before I could unpack python3-minimal and python3-apt. After that it worked though.
bdmurray@clean-xenial-amd64:~$ sudo dpkg --unpack python3-minimal_3.6.3-0ubuntu3_amd64.deb (Reading database ... 209665 files and directories currently installed.) Preparing to unpack python3-minimal_3.6.3-0ubuntu3_amd64.deb ... Unpacking python3-minimal (3.6.3-0ubuntu3) over (3.5.1-3) ... Processing triggers for man-db (2.7.5-1) ... bdmurray@clean-xenial-amd64:~$ sudo dpkg --unpack python3-apt_1.4.0~beta3build2_amd64.deb (Reading database ... 209665 files and directories currently installed.) Preparing to unpack python3-apt_1.4.0~beta3build2_amd64.deb ... Unpacking python3-apt (1.4.0~beta3build2) over (1.1.0~beta1build1) ... -- 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: python3-minimal should predepend on versioned version of python3-minimal To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/python3-defaults/+bug/1768379/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs