Para openSUSE Leap 15.3 corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:ruby:extensions/openSUSE_Leap_15.3/devel:languages:ruby:extensions.repo
zypper refresh
zypper install rubygem-ruby2ruby
Para SLE 15 SP4 corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:ruby:extensions/SLE_15_SP4/devel:languages:ruby:extensions.repo
zypper refresh
zypper install rubygem-ruby2ruby
Para SLE 15 SP3 corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:ruby:extensions/SLE_15_SP3/devel:languages:ruby:extensions.repo
zypper refresh
zypper install rubygem-ruby2ruby
Para SLE 15 SP2 corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:ruby:extensions/SLE_15_SP2/devel:languages:ruby:extensions.repo
zypper refresh
zypper install rubygem-ruby2ruby
Para SLE 12 corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:ruby:extensions/SLE_12/devel:languages:ruby:extensions.repo
zypper refresh
zypper install rubygem-ruby2ruby