Para openSUSE Tumbleweed corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:python:certbot/openSUSE_Tumbleweed/devel:languages:python:certbot.repo
zypper refresh
zypper install python-dns-lexicon
Para 16.0 corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:python:certbot/16.0/devel:languages:python:certbot.repo
zypper refresh
zypper install python-dns-lexicon
Para 15.6 corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:python:certbot/15.6/devel:languages:python:certbot.repo
zypper refresh
zypper install python-dns-lexicon