Problem with the Portuguese keyboard layout

[Elísio Simão]

In Ubuntu 11.10 "Oneiric Ocelot", the Portuguese keyboard layout is partial incorrect as some specific keys of this keyboard are switched. Is there any way I can fix this? Can I add different or legacy keyboard layouts is there any way to edit this keyboard layout?
After some updates, now when I choose to use Portuguese (Nativo) layout in "Keyboard Layout" from "System Settings" I have the following error:

Error activating XKB configuration.
There can be various reasons for that.

Results:

 • xprop -root | grep XKB
     _XKB_RULES_NAMES_BACKUP(STRING) = "evdev", "pc105", "pt", "", ""
     _XKB_RULES_NAMES(STRING) = "evdev", "macbook78", "pt,pt", ",nativo", "grp:shift_caps_toggle"

 • gsettings get org.gnome.libgnomekbd.keyboard model
    'macbook78'

 • gsettings get org.gnome.libgnomekbd.keyboard layouts
    ['pt', 'pt\tnativo']

 • gsettings get org.gnome.libgnomekbd.keyboard options
    ['grp\tgrp:shift_caps_toggle']

Thank you in advance.

[Dmitry Shachnev (mitya57)]

Can you attach/paste terminal output of the commands listed?

[Elísio Simão (emsimao)]

Done.
The strange thing is the keyboard model, which in fact is not a macbook but a toshiba.

[Paulo Costa (oliveira-phc)]

I believe that the text entry "Portuguese (Brazil, nativo for US keyboards)" presents a Dvorak layout, which is very different from a US keyboad. I attached a picture for first text entry.