Ubuntu 18.04 LTS change hostname permanently

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I am a new Ubuntu Linux 18.04 LTS cloud server user. By default my serer name to ‘localhost’ during installation but now I would like to change the computer name to ‘u1804-nixcraft’. Can you tell me how do I I remove localhost and set it to u1804-nixcraft on Ubuntu 18.04 Linux? How do I change the Ubuntu computer name from ‘localhost’ to ‘u1804-nixcraft’? Can you tell me more about Ubuntu Linux change hostname command?