Para openSUSE Tumbleweed execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/filesharing/openSUSE_Tumbleweed/filesharing.repo
zypper refresh
zypper install gnunet-gtk
Para 16.0 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/filesharing/16.0/filesharing.repo
zypper refresh
zypper install gnunet-gtk
Para 15.6 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/filesharing/15.6/filesharing.repo
zypper refresh
zypper install gnunet-gtk