Knoppix 3.8.1 don't save some settings to knoppix.img

I have made a persistent disk image and it works fine. Anyhow I can't save some setting, e.g.:

Code:

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install-keymap fi-latin1

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or

Code:

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gpm -t  ps2

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Why is this? I like use virtual terminals and these are essential to me.

-tapsa-]