installing hadoop in ubuntu showing error while using this command “~/Downloads/hadoop-3.2.1/sbin/start-dfs.shafter”

Question

Starting namenodes on [gorru4-Lenovo-ideapad-110-15ACL] gorru4-Lenovo-ideapad-110-15ACL: Warning: Permanently added \'gorru4-lenovo-ideapad-110-15acl\' (ECDSA) to the list o