He and his wife and daughter are buried in Ottobeuren, see https://www.findagrave.com/memorial/232943804/franz-xaver-von_huber
I made the memorial at findagrave on the basis of https://www.ottobeuren-macht-geschichte.de/items/show/704 --> there are pictures of epithaphs from the cemetery and the text gives the copys and further details. So, Franz Xaver wars born 3. December 1744 and died 21. February 1806. He was Oberamtmann which is some kind of high ranking officer, maybe of admiration or jurisdiction.
