Para openSUSE Tumbleweed execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/electronics/openSUSE_Tumbleweed/electronics.repo
zypper refresh
zypper install ngspice
Para 15.6 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/electronics/15.6/electronics.repo
zypper refresh
zypper install ngspice
Para 15.5 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/electronics/15.5/electronics.repo
zypper refresh
zypper install ngspice
Para 15.4 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/electronics/15.4/electronics.repo
zypper refresh
zypper install ngspice