Для 15.6 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:jejb1:Tumbleweed/15.6/home:jejb1:Tumbleweed.repo
zypper refresh
zypper install dirmngr
Для 15.5 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:jejb1:Tumbleweed/15.5/home:jejb1:Tumbleweed.repo
zypper refresh
zypper install dirmngr
Для 15.4 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:jejb1:Tumbleweed/15.4/home:jejb1:Tumbleweed.repo
zypper refresh
zypper install dirmngr