Upgrade from ESXi 7.0.1-16850804 to 7.0u1d failed with message "VMware Update Manager baseline group creation failed". Is there a know resolution for that error?
as per the Release notes of 4.2 there is one known issue on esxi upgrade. i.e.
Due to a known vSphere issue, the ESXi upgrade may fail with a "ConstraintValidationException" error when a host is skipped.
Workaround: Check the vSphere Client and its logs for details on what caused the error. Resolve the issues and retry the upgrade.