Control-[ as Esc not working on apple aluminum (on a PC)

This is quite a specific problem:

I'm using Ubuntu 10.04 in a PC, but I use a Apple Aluminum keyboard.

Strangely, the Control-[ combination is not working as "Esc" on Vim.
Instead
it is the Control-] which works as "esc".

However, the correct characters are printed by each key, so actually
is seems
that the mapping of the key is bound to the key position instead of
its actual
character, which is strange.

Anyone has any idea how this can be fixed? Alternatively, how can I
map
the Control-[ stroke to "esc"?

Thanks,
Leandro.

Ps. Also, and that is probably related, in gnu-screen the "Control-a
[" goes to copy
mode, but the "control-a control-[" does not, and the "control-a
control-]" does it. So,
what seems to be wrong is that after pressing control the "]" key
behaves as "["

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