Danish Mac keyboard layout isn't correct

Question

No matter which one of the 5 available Danish keyboard layouts I choose from, the @ symbol (at) is always Alt-2 instead of the Alt-', which is normal on Danish Mac keyboards.

The answer to No keyboard layout in keyboard preferences to match Danish macbook doesn't fix this.

List of Danish keyboard layouts in Ubuntu:

Danish (Macintosh) keyboard layout in Ubuntu:

Danish keyboard layout in Mac OS X (no modifiers, shift, alt, alt+shift):

If there is not an easy way to fix this without manually changing all the keys, could I use the following text to automate this?

1:              $1234567890+´
2:              qwertyuiopå¨
3:              asdfghjklæø'
4:              <zxcvbnm,.-

SHIFT-1:        §!"#€%&/()=?`
SHIFT-2:        QWERTYUIOPÅ^
SHIFT-3:        ASDFGHJKLÆØ*
SHIFT-4:        >ZXCVBNM;:_

ALT-1:          ¡“§£∞™¶[]≠±'
ALT-2:          °∑鮆¥ü|œπ‘~
ALT-3:          ªß∂ƒ©«‹∆¬äö@
ALT-4:          ≤Ω…ç√∫ñµ‚·–

SHIFT+ALT-1:    '¯”$¢‰˜\{}≈¿⁄
SHIFT+ALT-2:    •˚ɇŸÜıŒ∏’^
SHIFT+ALT-3:    Êˇ˘fiÁ»›˝flÄÖº
SHIFT+ALT-4:    ≥¸˙Ç◊ËÑ˛„÷—

Solution

Edit (2021-04-11):

After having to setup a Macbook with Ubuntu again (almost 8 years after asking this question!), I created dk_mac_fixed-layout, which fixes some keys.

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Old answer:

By searching launchpad.net I found several bugs about this.

One of the people mentioned a fix, with the instructions here: http://howto.praqma.net/ubuntu/keyboard

This keyboard is not exactly the correct Danish MacBook keyboard layout, but it is much better than the one that comes with Ubuntu.