对于 15.6，请以根用户 root 运行下面命令：
zypper addrepo https://download.opensuse.org/repositories/server:Kolab:16.2/15.6/server:Kolab:16.2.repo
zypper refresh
zypper install roundcubemail-plugins-kolab
对于 15.5，请以根用户 root 运行下面命令：
zypper addrepo https://download.opensuse.org/repositories/server:Kolab:16.2/15.5/server:Kolab:16.2.repo
zypper refresh
zypper install roundcubemail-plugins-kolab
对于 15.4，请以根用户 root 运行下面命令：
zypper addrepo https://download.opensuse.org/repositories/server:Kolab:16.2/15.4/server:Kolab:16.2.repo
zypper refresh
zypper install roundcubemail-plugins-kolab