Inserting Option "DRI" "false" into xorg.conf as suggested in #120834 stopped the crashes, but made FlightGear unusably slow (frame rate dropped from 10-11 to 1-2).
Inserting Option "DRI" "false" into xorg.conf as suggested in #120834 stopped the crashes, but made FlightGear unusably slow (frame rate dropped from 10-11 to 1-2).