[Satellite 6.11] update capsule server to 6.11 failed:"Scenario [Migration scripts to Capsule 6.11] failed."

Issue

• Upgrade capsule server to 6.11 failed:

  There were errors detected during install.
  Please address the errors and re-run the installer to ensure the system is properly configured.
  Failing to do so is likely to result in broken functionality.
  The full log is at /var/log/foreman-installer/capsule.log
                                      [FAIL]
Failed executing LANG=en_US.utf-8 foreman-installer  --disable-system-checks, exit status 6
--------------------------------------------------------------------------------
Scenario [Migration scripts to Capsule 6.11] failed.

The following steps ended up in failing state:

  [installer-upgrade]

Resolve the failed steps and rerun the command.

If the situation persists and, you are unclear what to do next,
contact Red Hat Technical Support.

In case the failures are false positives, use
--whitelist="installer-upgrade"