The installer self-update failed due to unexpected package versions in the self-update repository

SUSE Linux Enterprise Server 15 SP6

During an attempted upgrade or installation of SLES 15 SP6, an error occurred due to unexpected package versions found within the self-update repository:

Error

The installer found unexpected package versions in the installer
self update repository. Make sure that the self update
URL points to a correct repository.

Configured update repositories:
<URL>

Installation system: SUSE Linux Enterprise 15 SP6

The installer self update will be skipped.

OK

The installer self-update should only be used with GA ISO, such as SLE-15-SP6-Full-x86_64-GM-Media1.iso or a tftpboot installation package from GA repository.

When using a Quarterly Update Image (e.g., SLE-15-SP6-Full-x86_64-QU2-Media1.iso) or a tftpboot installation package that is newer than the GA package (e.g., tftpboot-installation-SLE-15-SP6-x86_64-16.59.16-150600.3.7.2.noarch.rpm), the self-update should be skipped.

The kernel's command line option self-update=0 can be used to bypass the Installer self-update.

The installer's self-update functionality in SLE15 SP2 and later versions includes a safety check to prevent crashes and unexpected behavior. This check compares the versions of specific packages in both the self-update repository and the inst-sys. If a mismatch is detected, the self-update process is aborted and an error message is displayed, indicating the use of an incompatible self-update repository.