Para openSUSE Tumbleweed execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:aeneas_jaissle:kolab_test:3/openSUSE_Tumbleweed/home:aeneas_jaissle:kolab_test:3.repo
zypper refresh
zypper install roundcubemail
Para 15.6 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:aeneas_jaissle:kolab_test:3/15.6/home:aeneas_jaissle:kolab_test:3.repo
zypper refresh
zypper install roundcubemail
Para 15.5 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:aeneas_jaissle:kolab_test:3/15.5/home:aeneas_jaissle:kolab_test:3.repo
zypper refresh
zypper install roundcubemail