Es un error de una de las librerías de python, o te falta una o la version es inferior a la recomendada.
Abre una consola y ejecuta
sudo zypper inr && sudo zypper verify
Si sigues con problemas, reportalo a forum ingles o a bugzilla de openSUSE.
Código:
zypper se -iv firewall
Cargando datos del repositorio...
Leyendo los paquetes instalados...
E | Nombre | Tipo | Versión | Arquitectura | Repositorio
---+------------------+------------+--------------------+--------------+------------------------------
i+ | Firewall | aplicación | | noarch | openSUSE-Leap-15.0-Oss
name: application:Firewall
i+ | Firewall | aplicación | | noarch | (Paquetes del sistema)
name: application:Firewall
i+ | SuSEfirewall2 | paquete | 3.6.378-lp150.1.15 | noarch | openSUSE-Leap-15.0-Oss
name: SuSEfirewall2
i+ | SuSEfirewall2 | paquete | 3.6.378-lp150.1.15 | noarch | (Paquetes del sistema)
name: SuSEfirewall2
i+ | firewall-config | paquete | 0.5.3-lp150.2.3.1 | noarch | openSUSE-Leap-15.0-Update-Oss
name: firewall-config
i+ | firewall-config | paquete | 0.5.3-lp150.2.3.1 | noarch | (Paquetes del sistema)
name: firewall-config
i | firewall-macros | paquete | 0.5.3-lp150.2.3.1 | noarch | openSUSE-Leap-15.0-Update-Oss
name: firewall-macros
i | firewall-macros | paquete | 0.5.3-lp150.2.3.1 | noarch | (Paquetes del sistema)
name: firewall-macros
i | firewalld | paquete | 0.5.3-lp150.2.3.1 | noarch | openSUSE-Leap-15.0-Update-Oss
name: firewalld
i | firewalld | paquete | 0.5.3-lp150.2.3.1 | noarch | (Paquetes del sistema)
name: firewalld
i | firewalld-lang | paquete | 0.5.3-lp150.2.3.1 | noarch | openSUSE-Leap-15.0-Update-Oss
name: firewalld-lang
i | firewalld-lang | paquete | 0.5.3-lp150.2.3.1 | noarch | (Paquetes del sistema)
name: firewalld-lang
i | python3-firewall | paquete | 0.5.3-lp150.2.3.1 | noarch | openSUSE-Leap-15.0-Update-Oss
name: python3-firewall
i | python3-firewall | paquete | 0.5.3-lp150.2.3.1 | noarch | (Paquetes del sistema)
name: python3-firewall
i+ | yast2-firewall | paquete | 4.0.25-lp150.1.1 | noarch | openSUSE-Leap-15.0-Oss
name: yast2-firewall
i+ | yast2-firewall | paquete | 4.0.25-lp150.1.1 | noarch | (Paquetes del sistema)
name: yast2-firewall
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