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) ...
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 minimal_ 3.6.3-0ubuntu3_ amd64.deb ... clean-xenial- amd64:~ $ sudo dpkg --unpack python3- apt_1.4. 0~beta3build2_ amd64.deb apt_1.4. 0~beta3build2_ amd64.deb ...
(Reading database ... 209665 files and directories currently installed.)
Preparing to unpack python3-
Unpacking python3-minimal (3.6.3-0ubuntu3) over (3.5.1-3) ...
Processing triggers for man-db (2.7.5-1) ...
bdmurray@
(Reading database ... 209665 files and directories currently installed.)
Preparing to unpack python3-
Unpacking python3-apt (1.4.0~beta3build2) over (1.1.0~beta1build1) ...