RHEL7: "leapp preupgrade" fails with message "Failed to synchronize cache for repo"

Solution Verified - Updated -

Issue

  • leapp preupgrade fails with below error when system is registered to Red Hat customer portal using RHSM :
Unable to install RHEL 8 userspace packages.
'dnf', 'install', '-y', '--nogpgcheck', '--setopt=module_platform_id=platform:el8', '--setopt=keepcache=1', '--releasever', u'8.4', '--installroot', '/el8target', '--disablerepo', '*', '--enablerepo', u'rhel-8-for-x86_64-baseos-rpms', '--enablerepo', u'rhel-8-for-x86_64-appstream-rpms', 'dnf'] failed with exit code 1.
            Failed to synchronize cache for repo 'rhel-8-for-x86_64-appstream-rpms', ignoring this repo.
            Failed to synchronize cache for repo 'rhel-8-for-x86_64-baseos-rpms', ignoring this repo.
            Error: Unable to find a match: dnf

Environment

  • Red Hat Enterprise Linux 7.9
    • leapp
    • proxy

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