The issue seems to be that in Cosmic the libboost-python lib naming convention has changed and that affects the debian rules scripts picking the correct lib python version.
Bionic: /usr/lib/x86_64-linux-gnu/libboost_python-py36.so.1.62.0 Cosmic: /usr/lib/x86_64-linux-gnu/libboost_python36.so.1.67.0 https://packages.ubuntu.com/bionic/amd64/libboost-python1.62.0/filelist https://packages.ubuntu.com/cosmic/amd64/libboost-python1.67.0/filelist -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1800264 Title: python3-libtorrent linking libboost_python27.so instead of libboost_python36.so To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libtorrent-rasterbar/+bug/1800264/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs