It looks like there are three failed tasks in all, and I can see three errors in the pulpcore-worker tracing you provided. The last of the three seems to be the same error reported here: Katello::Errors::Pulp3Error: column deb_aptremote.ignore_missing_package_indices does not exist - #3 by senetm For which I have opened a pulp_deb issue here: Issue #9165: KeyError: 'amd64' when creating publications during 2to3 migration - Debian Support - Pulp
The other two errors seem to be a completely different issue.