/usr/share/cegui-0.8.4/looknfeel/GameMenu.looknfeel is in libcegui-mk2-doc 0.8.4+dfsg-4ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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<!--
    GameMenu.looknfeel by Lukas E. Meindl
    This looknfeel was created for the GameMenu Demo
-->
<Falagard version="7">
    
    <WidgetLook name="GameMenu/Editbox">
        <PropertyDefinition redrawOnWrite="true" initialValue="FFFFFFFF" type="ColourRect" name="NormalTextColour"/>
        <PropertyDefinition redrawOnWrite="true" initialValue="FF000000" type="ColourRect" name="SelectedTextColour"/>
        <PropertyDefinition redrawOnWrite="true" initialValue="FFB6D142" type="ColourRect" name="ActiveSelectionColour"/>
        <PropertyDefinition redrawOnWrite="true" initialValue="FF808080" type="ColourRect" name="InactiveSelectionColour"/>
        <Property name="MouseCursorImage" value="GameMenuImages/MouseTextBar"/>
        <Property name="Size" value="{{0, 256}, {0, 32}}" />
        <NamedArea name="TextArea">
            <Area>
                <Dim type="LeftEdge">
                    <ImageDim name="GameMenuImages/EditboxLeft" dimension="Width"/>
                </Dim>
                <Dim type="TopEdge">
                    <ImageDim name="GameMenuImages/EditboxTop" dimension="Height"/>
                </Dim>
                <Dim type="RightEdge">
                    <OperatorDim op="Subtract">
                        <UnifiedDim scale="1" type="RightEdge"/>
                        <ImageDim name="GameMenuImages/EditboxRight" dimension="Width"/>
                    </OperatorDim>
                </Dim>
                <Dim type="BottomEdge">
                    <OperatorDim op="Subtract">
                        <UnifiedDim scale="1" type="BottomEdge"/>
                        <ImageDim name="GameMenuImages/EditboxBot" dimension="Height"/>
                    </OperatorDim>
                </Dim>
            </Area>
        </NamedArea>
        <ImagerySection name="container_normal">
            <FrameComponent>
                <Image component="TopLeftCorner" name="GameMenuImages/EditboxLeftTop"/>
                <Image component="TopRightCorner" name="GameMenuImages/EditboxRightTop"/>
                <Image component="BottomLeftCorner" name="GameMenuImages/EditboxLeftBot"/>
                <Image component="BottomRightCorner" name="GameMenuImages/EditboxRightBot"/>
                <Image component="LeftEdge" name="GameMenuImages/EditboxLeft"/>
                <Image component="RightEdge" name="GameMenuImages/EditboxRight"/>
                <Image component="TopEdge" name="GameMenuImages/EditboxTop"/>
                <Image component="BottomEdge" name="GameMenuImages/EditboxBot"/>
                <Image component="Background" name="GameMenuImages/EditboxMid"/>
            </FrameComponent>
        </ImagerySection>
        <ImagerySection name="selection">
            <ImageryComponent>
                <Image name="GameMenuImages/GenericBrush"/>
                <VertFormat type="Stretched"/>
                <HorzFormat type="Stretched"/>
            </ImageryComponent>
        </ImagerySection>
        <ImagerySection name="Caret">
            <ImageryComponent>
                <Area>
                    <Dim type="Width">
                        <AbsoluteDim value="3"/>
                    </Dim>
                </Area>
                <Image name="GameMenuImages/GenericBrush"/>
                <VertFormat type="Stretched"/>
                <HorzFormat type="Stretched"/>
            </ImageryComponent>
        </ImagerySection>
        <StateImagery name="Enabled">
            <Layer>
                <Section section="container_normal"/>
            </Layer>
        </StateImagery>
        <StateImagery name="ReadOnly">
            <Layer>
                <Section section="container_normal"/>
            </Layer>
        </StateImagery>
        <StateImagery name="Disabled">
            <Layer>
                <Section section="container_normal">
                    <Colours topLeft="FF7F7F7F" bottomLeft="FF7F7F7F" topRight="FF7F7F7F" bottomRight="FF7F7F7F"/>
                </Section>
            </Layer>
        </StateImagery>
        <StateImagery name="ActiveSelection">
            <Layer>
                <Section section="selection">
                    <ColourProperty name="ActiveSelectionColour"/>
                </Section>
            </Layer>
        </StateImagery>
        <StateImagery name="InactiveSelection">
            <Layer>
                <Section section="selection">
                    <ColourProperty name="InactiveSelectionColour"/>
                </Section>
            </Layer>
        </StateImagery>
    </WidgetLook>
    
</Falagard>
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