/usr/bin/python3.6:11:visit_decref:dict_traverse:subtract_refs:collect:collect_with_callback

[errors.ubuntu.com bug bridge]

The Ubuntu Error Tracker has been receiving reports about a problem regarding python3.6. This problem was most recently seen with package version 3.6.8-1~18.10, the problem page at https://errors.ubuntu.com/problem/40a363eada077777a0c969ecd644b327eeddd05f contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
If you do not have access to the Ubuntu Error Tracker and are a software developer, you can request it at http://forms.canonical.com/reports/.