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I got the same error message before installing python-monotonic, and I have forwarded this issue to the Debian maintainer (see the attached bug watch). When reporting bugs in the future please use apport by using 'ubuntu- bug' and the name of the package affected. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs. ** Bug watch added: Debian Bug tracker #907255 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=907255 ** Also affects: oz (Debian) via https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=907255 Importance: Unknown Status: Unknown ** Changed in: oz (Ubuntu) Status: New => Confirmed ** Tags added: bionic cosmic packaging -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1773310 Title: missing dependency python-monotonic To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/oz/+bug/1773310/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs