Do you know Shinux?
It is a Gnu/linux OS available on a usb flash key, downloadable for free, you can buy a key, too.
I didn't test it, but why not register there?
New: Gopherus (Feb 14, 2023), Platform 24.1 (Feb 13, 2023)
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Cool, I didn't know about that one. I'm writing up brief synopsis of a couple Linux variants that work on USB.
Sometimes, the impossible can become possible, if you're awesome!
i use DSL (damn small linux- excuse the lang). it is only 50 mb and it has a great embeded version that will open up linux in a window so you dont need to reboot: which is just about the coolest thing ever. i should check that one out too though.
EDIT: dont know french.