The instructions on that web page seem to be outdated: blackbox:~ # zypper in --from Kernel:SLE15-SP3 kernel-default Retrieving repository 'Kernel:SLE15-SP3' metadata ................................................[error] Repository 'Kernel:SLE15-SP3' is invalid. [Kernel:SLE15-SP3|https://download.opensuse.org/repositories/Kernel:/SLE15-SP3/standard] Valid metadata not found at specified URL History: - [Kernel:SLE15-SP3|https://download.opensuse.org/repositories/Kernel:/SLE15-SP3/standard] Repository type can't be determined.