Forwarding this bug from Ubuntu:
https://bugs.edge.launchpad.net/ubuntu/+source/xkeyboard-config/+bug/108014

The user reports that there were some issues with the maltese keyboard layout, that he fixed by copying some items from the GB layout.  I'm forwarding this to be reviewed/incorporated upstream rather than just in Ubuntu.

--- mt.bak 2008-08-03 07:32:34.000000000 +0200
+++ mt 2008-08-03 07:39:13.000000000 +0200
@@ -12,6 +12,12 @@

     name[Group1]="Malta";

+ // 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 ] };