Merge pull request #737 from Calvin-L/patch-1-on-test-branch

Flush disk writes before reboot (resubmit)

auto_install/install.sh

@@ -1372,6 +1372,10 @@ main() {
             ;;
     esac
     
+    # Ensure that cached writes reach persistent storage
+    echo "::: Flushing writes to disk..."
+    sync
+
     echo "::: done."
 
     if [[ "${useUpdateVars}" == false ]]; then