Only unmount if there is a mount

builder/cmds/autostart.sh

@@ -53,6 +53,9 @@ if [[ $(tty) == "/dev/tty1" ]]; then
   # Get username from installer config for reliable error recovery
   OMARCHY_USER="$(jq -r '.users[0].username' user_credentials.json)"
 
+  # Ensure that no mounts exist from past install attempts
+  findmnt -R /mnt >/dev/null && umount -R /mnt
+
   # Install using files generated by the ./configurator
   archinstall \
     --config user_configuration.json \