Likely because of the usrmerge change on TW. The package was built before that. You can install the package via rpm directly, e.g. rpm -ivh kernel-default-5.0.13-1.1.gb11e2d7.x86_64.rpm --nodeps --oldpackage And pass --test in addition for checking the installation, too. But, maybe you can start from other later 5.x kernel packages which is after usrmerge, too.