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To set default editor in Ubuntu/Debian, run
<pre>
update-alternatives --config editor
</pre>
<img loading="lazy" decoding="async" src="https://backend.serverok.in/wp-content/uploads/2019/09/ubuntu-set-default-editor.png" alt="Ubuntu default editor" width="896" height="272" class="alignnone size-full wp-image-4596" srcset="https://backend.serverok.in/wp-content/uploads/2019/09/ubuntu-set-default-editor.png 896w, https://backend.serverok.in/wp-content/uploads/2019/09/ubuntu-set-default-editor-300x91.png 300w, https://backend.serverok.in/wp-content/uploads/2019/09/ubuntu-set-default-editor-768x233.png 768w" sizes="auto, (max-width: 896px) 100vw, 896px" />
See <a href="/update-alternatives">update-alternatives</a>

Set default editor in Ubuntu