After a lot of work, I finally found where is the problem.
Ubuntu (Feisty and Gutsy) can recognize my SD card 2 Go... only if it is in FAT32.
In FAT16, the automount is not possible.
It is the easiest way to solve the problem.
But it remains a problem, as many SD cards were formatted by APN or PocketPC. And lot of them don't support the new standard : SD 2.0, and then format the card in FAT (FAT16).
Though you can't format your card to be read on Ubuntu without losing the data stored in it.
After a lot of work, I finally found where is the problem.
Ubuntu (Feisty and Gutsy) can recognize my SD card 2 Go... only if it is in FAT32.
In FAT16, the automount is not possible.
It is the easiest way to solve the problem.
But it remains a problem, as many SD cards were formatted by APN or PocketPC. And lot of them don't support the new standard : SD 2.0, and then format the card in FAT (FAT16).
Though you can't format your card to be read on Ubuntu without losing the data stored in it.