Para openSUSE Tumbleweed execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/Base:System/openSUSE_Tumbleweed/Base:System.repo
zypper refresh
zypper install plymouth
Para openSUSE Factory execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/Base:System/openSUSE_Factory/Base:System.repo
zypper refresh
zypper install plymouth
Para 16.0 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/Base:System/16.0/Base:System.repo
zypper refresh
zypper install plymouth
Para 15.6 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/Base:System/15.6/Base:System.repo
zypper refresh
zypper install plymouth