Setting ip Static Ubuntu 20.04 LTS Server

Login ke Server via ssh

ssh user@10.10.10.123 =======> (contoh ip server masih dinamis)

Jika muncul seperti ini :

The authenticity of host '10.20.30.123 (10.20.30.123)' can't be established.
ECDSA key fingerprint is SHA256:mRHmQmfcwAjDpTIKO7UfwkeULPUvpJdXLQWMcSF/HRA.
Are you sure you want to continue connecting (yes/no)?

Ketik yes <enter>

akan muncul :
Warning: Permanently added '10.10.10.123' (ECDSA) to the list of known hosts.

Masukkan password

user@10.10.10.123's password: ***** <enter>

akan muncul Welcome Page seperti ini
Welcome to Ubuntu 20.04.6 LTS (GNU/Linux 5.4.0-163-generic x86_64)

* Documentation:  https://help.ubuntu.com
* Management:     https://landscape.canonical.com
* Support:        https://ubuntu.com/advantage

 System information as of Fri 22 Sep 2023 08:22:54 AM UTC
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Last login: Fri Sep 22 03:44:05 2023 from 10.10.10.123