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

Flush disk writes before reboot (resubmit)

auto_install/install.sh

@@ -1371,6 +1371,10 @@ main() {
             $SUDO systemctl start openvpn.service
             ;;
     esac
+    
+    # Ensure that cached writes reach persistent storage
+    echo "::: Flushing writes to disk..."
+    sync
 
     echo "::: done."