VMware Update Manager Error while upgrading from Esxi 5.0 to ESXi5.5

Remediate task fails with error “Cannot execute upgrade script on host.”. This is an unidentified issue as of now and no KB article available. Workaround is manually disable HA agent on host and start remediate task again.
Disable HA agent manually using ssh session.
#cp /opt/vmware/uninstallers/VMware-fdm-uninstall.sh /tmp
#chmod +x /tmp/VMware-fdm-uninstall.sh
#/tmp/VMware-fdm-uninstall.sh

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