Для SLE 15 SP3 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/systemsmanagement:katello/SLE_15_SP3/systemsmanagement:katello.repo
zypper refresh
zypper install python3-gobject2
Для SLE 15 SP2 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/systemsmanagement:katello/SLE_15_SP2/systemsmanagement:katello.repo
zypper refresh
zypper install python3-gobject2
Для SLE 15 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/systemsmanagement:katello/SLE_15/systemsmanagement:katello.repo
zypper refresh
zypper install python3-gobject2