This comment pertains to the bug report/comment by my above, and *not* to the bug originally reported by Brian Kelly, I believe.
I upgraded 4 machine. Two of those machines had Python 3 installed under /usr/local (from source). The other two did not have Python 3 installed under /usr/local. The two machines with Python 3 at /usr/local failed during the upgrade; the two that did not have Python 3 under /usr/local did not fail. So, I removed Python 3 from /usr/local/bin and /usr/local/lib. Now, I can run `sudo aptitude full-upgrade` without failures. Is it possible that this means that there is some Python script that is run during the install/upgrade than has "#!/usr/bin/env python3" at the top and that is being run as: $ ./somescript.py instead of as: $ python3 ./somescript.py Although, since "local" does not seem to show up in the traceback, I'm not sure ... -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to python3-defaults in Ubuntu. https://bugs.launchpad.net/bugs/1682934 Title: package python3 3.5.1-4 failed to install/upgrade: pre-dependency problem - not installing python3 Status in python3-defaults package in Ubuntu: Confirmed Bug description: Got this error while using "Transmageddon Video Transcoder" and again while updating 16.10 to 17.04. Seems to have something to do with needing that Python3 version for Teletext decoding in media that is in transport stream format (.ts). ProblemType: Package DistroRelease: Ubuntu 17.04 Package: python3 3.5.1-4 ProcVersionSignature: Ubuntu 4.10.0-19.21-generic 4.10.8 Uname: Linux 4.10.0-19-generic x86_64 ApportVersion: 2.20.4-0ubuntu4 Architecture: amd64 Date: Fri Apr 14 19:27:33 2017 ErrorMessage: pre-dependency problem - not installing python3 InstallationDate: Installed on 2015-05-01 (714 days ago) InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422) RelatedPackageVersions: dpkg 1.18.10ubuntu2 apt 1.4 SourcePackage: python3-defaults Title: package python3 3.5.1-4 failed to install/upgrade: pre-dependency problem - not installing python3 UpgradeStatus: Upgraded to zesty on 2017-04-14 (0 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/python3-defaults/+bug/1682934/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp