kernel-default-base from SUSE:SLE-15-SP3:Update project
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Add repository and install manually
For pool run the following as root:
zypper addrepo https://download.opensuse.org/repositories/SUSE:SLE-15-SP3:Update/pool/SUSE:SLE-15-SP3:Update.repo zypper refresh zypper install kernel-default-base