The HRESULT error code indicated a generic failure. John searched online for similar issues and found a few discussions about this error, but none of the suggested solutions worked.
"Unable to query the live Linux source machine. Full."
John decided to use an alternative conversion method. He created a VMware boot CD (using the VMware Standalone Converter) and booted linux01 from the CD. This allowed the converter tool to access the server's disk and perform a cold clone, rather than trying to query the live system.