https://www.boost.org/users/history/version_1_69_0.html
"Discontinued Libraries Signals (v1) is now removed. Its removal was announced in 1.68 and its deprecation was announced in 1.54. Boost 1.68 is the last release that provides this library. Users are encouraged to use Signals2 instead. The Boost community thanks Douglas Gregor for his work on Signals which served its users well and which also inspired Signals2." ** Changed in: boost-defaults (Ubuntu) Status: Confirmed => Invalid -- 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