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I tested this and got the same error message when attempting to run bouncy. Did some digging and found it is missing a dependency on python3-future. If you install that package manually, it seems to run as expected. I've also forwarded the issue to Debian, hopefully to get the dependency added in a newer version. ** Bug watch added: Debian Bug tracker #986577 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=986577 ** Also affects: bouncy (Debian) via https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=986577 Importance: Unknown Status: Unknown ** Changed in: bouncy (Ubuntu) Status: New => Confirmed ** Tags added: groovy hirsute packaging -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1922504 Title: missing past python module To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/bouncy/+bug/1922504/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs