There are currently no open bugs.

"libsignal-protocol-c" versions published in Ubuntu

Lunar (2.3.3-1): universe/misc
Kinetic (2.3.3-1): universe/misc
Jammy (2.3.3-1): universe/misc
Focal (2.3.2-2): universe/misc
Bionic (2.3.1+git20171007-3): universe/misc