Thank you both for your answers. I would like to understand why
restoring the backup doesn't restore my subkeys. On a fresh ~/.gnupg, I
did:
$ gpg --list-packets /media/mystick/key
gpg: keybox '/home/cassou/.gnupg/pubring.kbx' created
# off=0 ctb=94 tag=5 hlen=2 plen=134
:secret key
Hi Damien!
Upfront some information you might probably already know.
When you "normally" create a new public/private key pair technically
*two* key pairs are created. Cross check with "gpg -K". One secret key
(sec) for signing and certify marked [SC] and another one, a secret sub
key (ssb)
