Indeed, I saw this too. It appears that libbost-signals-dev is no longer built by the 1.71.0.0ubuntu2 source package ( https://bugs.launchpad.net/ubuntu/+source/boost- defaults/1.71.0.0ubuntu2). It is also absent from the Debian experimental package (https://tracker.debian.org/pkg/boost-defaults).
I didn't find any mentions of the package in the change logs so it is hard to tell if it was intentional or not. It could perhaps be explained by the jump from 1.67 to 1.71, but I am not familiar enough with upstream to tell if the library was dropped or not... ** Changed in: boost-defaults (Ubuntu) Status: New => Confirmed ** Tags added: packaging -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1876788 Title: libboost-signals-dev not present in focal (64 bit) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/boost-defaults/+bug/1876788/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs