Для openSUSE Tumbleweed запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/science/openSUSE_Tumbleweed/science.repo
zypper refresh
zypper install labplot-kf5
Для openSUSE Factory PowerPC запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/science/openSUSE_Factory_PowerPC/science.repo
zypper refresh
zypper install labplot-kf5
Для 15.7 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/science/15.7/science.repo
zypper refresh
zypper install labplot-kf5
Для 15.6 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/science/15.6/science.repo
zypper refresh
zypper install labplot-kf5