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 UE4EditorEnable 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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