Для openSUSE Tumbleweed запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:Indomitable/openSUSE_Tumbleweed/home:Indomitable.repo
zypper refresh
zypper install mono-complete
Для openSUSE 12.2 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:Indomitable/openSUSE_12.2/home:Indomitable.repo
zypper refresh
zypper install mono-complete
Для openSUSE 12.1 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:Indomitable/openSUSE_12.1/home:Indomitable.repo
zypper refresh
zypper install mono-complete