Для Tumbleweed запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:plater/Tumbleweed/home:plater.repo
zypper refresh
zypper install qterminal
Для Factory ARM запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:plater/Factory_ARM/home:plater.repo
zypper refresh
zypper install qterminal
Для Factory запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:plater/Factory/home:plater.repo
zypper refresh
zypper install qterminal