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/usr/share/X11/xkb/symbols/mt is in xkb-data 2.5-1ubuntu1.

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// Maltese keyboard map (based on MSA Standard DMS100)
// by Ramon Casha (ramon.casha@linux.org.mt)

partial default alphanumeric_keys
xkb_symbols "basic" {

    include "latin"

    name[Group1]="Maltese";

    // Copied from GB layout
    key <AE02> { [         2,   quotedbl,  twosuperior,    oneeighth ] };
    key <AE04> { [         4,     dollar,     EuroSign,   onequarter ] };
    key <AC11> { [apostrophe,         at, dead_circumflex, dead_caron] };
    key <BKSL> { [numbersign, asciitilde,   dead_grave,   dead_breve ] };

    // The following four sets are the four additional letters, with the UK
    // equivalents
    key <TLDE>	{ [ cabovedot,  Cabovedot,        grave,      notsign ]	};
    key <AD11>	{ [ gabovedot,  Gabovedot,  bracketleft,    braceleft ]	};
    key <AD12>	{ [   hstroke,    Hstroke, bracketright,   braceright ]	};
    key <LSGT>	{ [ zabovedot,  Zabovedot,    backslash,          bar ]	};

    // Euro symbol
    key <AE03>	{ [         3,   EuroSign,     sterling               ]	};

    // Long accent
    key <AE06>	{ [         6, asciicircum, dead_circumflex, dead_circumflex ]	};

    // Normal accented vowels
    key <AD03>	{ [         e,          E,       egrave,       Egrave ]	};
    key <AD07>	{ [         u,          U,       ugrave,       Ugrave ]	};
    key <AD08>	{ [         i,          I,       igrave,       Igrave ]	};
    key <AD09>	{ [         o,          O,       ograve,       Ograve ]	};
    key <AC01>	{ [         a,          A,       agrave,       Agrave ]	};

    include "level3(ralt_switch)"
};

// Maltese keyboard map (based on MSA Standard DMS100, annex A)
// by Ramon Casha (ramon.casha@linux.org.mt)

partial alphanumeric_keys
xkb_symbols "us" {

    include "latin"

    // Describes the differences between the mt
    // keyboard and a US-based physical keyboard

    name[Group1]="Maltese (with US layout)";

    // The following four sets are the four additional letters, with the US
    // equivalents
    key <TLDE>	{ [ cabovedot,  Cabovedot,        grave,   asciitilde ]	};
    key <AD11>	{ [ gabovedot,  Gabovedot,  bracketleft,    braceleft ]	};
    key <AD12>	{ [   hstroke,    Hstroke, bracketright,   braceright ]	};
    key <LSGT>	{ [ zabovedot,  Zabovedot,    backslash,          bar ]	};
    key <BKSL>	{ [ zabovedot,  Zabovedot,    backslash,          bar ]	};

    // Euro symbol
    key <AE03>	{ [         3,   EuroSign,     numbersign             ]	};

    // Long accent
    key <AE06>	{ [         6, asciicircum, dead_circumflex, dead_circumflex ]	};

    // Normal accented vowels
    key <AD03>	{ [         e,          E,       egrave,       Egrave ]	};
    key <AD07>	{ [         u,          U,       ugrave,       Ugrave ]	};
    key <AD08>	{ [         i,          I,       igrave,       Igrave ]	};
    key <AD09>	{ [         o,          O,       ograve,       Ograve ]	};
    key <AC01>	{ [         a,          A,       agrave,       Agrave ]	};

    include "level3(ralt_switch)"

};