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Answering my own question since I found a solution. You have to use the partition name for that command, not the LUKS mapping ... Here is what I did : (chroot) # cryptsetup luksAddKey swap /bt_keyfile.bin swap n'est pas un périphérique LUKS valide. (chroot) # cryptsetup luksAddKey /dev/mapper/swap /bt_keyfile.bin /dev/mapper/swap n'est pas un périphérique LUKS valide. (chroot) # cryptsetup luksAddKey /dev/sda3 /bt_keyfile.bin Entrez une phrase secrète existante : (chroot) # echo ### yes it worked! #### Sorry for the noise, Bernard