Package: x2goclient Version: 4.1.2.2
The x2goclient package for openSUSE Leap 15.0 seems to have gone missing from the official repository at <http://packages.x2go.org/opensuse/15.0/main/x86_64/>. It has been gone since at least December 2018.
openSUSE Leap 15.0 reached end of life on 2019-12-03. If you're no longer interested in supporting it with official RPMs, then I suppose it would be fine to close this bug now.
x2goclient packages for openSUSE 15.0 seem to have magically appeared in the repository (both the stable one and the heuler one) some time ago. This bug can be closed.