There are currently no open bugs.

"unicorn" versions published in Ubuntu

Disco (5.4.0-1build1): universe/ruby
Cosmic (5.4.0-1build1): universe/ruby
Bionic (5.4.0-1build1): universe/ruby
Xenial (4.9.0-2build2): universe/ruby
Trusty (4.7.0-1): universe/ruby