icingaweb2-theme-openSUSE from openSUSE:infrastructure project
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Add repository and install manually
For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/openSUSE:infrastructure/openSUSE_Tumbleweed/openSUSE:infrastructure.repo zypper refresh zypper install icingaweb2-theme-openSUSE