Clone this to your UnrealEngine directory at Engine/Plugins/Developer.

Add in Engine/Config/Linux/LinuxEngine.ini

[/Script/SourceCodeAccess.SourceCodeAccessSettings]
PreferredAccessor=SensibleEditorSourceCodeAccessor

and then in the head folder UnrealEngine:

make UE4Editor

Enable this as your code view editor.

Ubuntu:

You need to select a gui editor with select-editor.

Gentoo:

Select a gui editor witheselect editor.

Debian:

Use update-alternatives --config editor.

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