It is available if one selects (10) ECC (sign only). Upon selectgin (9) i believe you will generate two keys the Curve25519 for signing and another one for encryption. From above it seems you are selecting wich algo to use for the encryption key, as Curve25519 is not yet standartised for encryption.
** Changed in: gnupg2 (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1702782 Title: Curve25519 option is missing??? To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnupg2/+bug/1702782/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs