Your package ucx failed to build from source in current F28. https://koji.fedoraproject.org/koji/taskinfo?taskID=24901110 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild
Created an issue in UCX github: https://github.com/openucx/ucx/issues/2401.
Will be fixed in v1.3.1
A build was successfull: ucx-1.2.2-1.fc28 [1]. No update was found in bodhi. Closing the bug nonetheless. [1] https://koji.fedoraproject.org/koji/buildinfo?buildID=1017097