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/usr/share/X11/xkb/compat/pc is in xkb-data 2.5-1ubuntu1.

This file is owned by root:root, with mode 0o644.

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default partial xkb_compatibility "pc"  {

    // Sets the "Alt" virtual modifier

    virtual_modifiers	Alt;

    setMods.clearLocks= True;
    interpret Alt_L+Any     { 
	virtualModifier= Alt;
	action = SetMods(modifiers=modMapMods);
    };

    interpret Alt_R+Any	{
	virtualModifier= Alt;
	action = SetMods(modifiers=modMapMods);
    };
};