I also performed an upgrade of an Ubuntu Desktop system from xenial w/ -proposed enabled to artful so that python3-minimal from artful-proposed would be used and the upgrade proceeded without error.
bdmurray@clean-xenial-amd64:/tmp/ubuntu-release-upgrader-355quvv3$ grep -C10 python3-minimal /var/log/dist-upgrade/apt-term.log Processing triggers for mime-support (3.59ubuntu1) ... Processing triggers for hicolor-icon-theme (0.15-0ubuntu1) ... Processing triggers for cups (2.1.3-4) ... Updating PPD files for postscript-hp ... Setting up libssl1.0.0:amd64 (1.0.2g-1ubuntu13.6) ... Setting up libpython3.6-minimal:amd64 (3.6.3-1ubuntu1) ... Setting up libexpat1:amd64 (2.2.3-1) ... Setting up python3.6-minimal (3.6.3-1ubuntu1) ... Processing triggers for libc-bin (2.26-0ubuntu2.1) ... (Reading database ... 209379 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) ... Setting up python3-minimal (3.6.3-0ubuntu3) ... (Reading database ... 209379 files and directories currently installed.) Preparing to unpack .../python3_3.6.3-0ubuntu3_amd64.deb ... running python pre-rtupdate hooks for python3.6... Unpacking python3 (3.6.3-0ubuntu3) over (3.5.1-3) ... Preparing to unpack .../mime-support_3.60ubuntu1_all.deb ... Unpacking mime-support (3.60ubuntu1) over (3.59ubuntu1) ... Selecting previously unselected package libpython3.6-stdlib:amd64. Preparing to unpack .../libpython3.6-stdlib_3.6.3-1ubuntu1_amd64.deb ... Unpacking libpython3.6-stdlib:amd64 (3.6.3-1ubuntu1) ... Selecting previously unselected package python3.6. -- 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