Comment 8 for bug 1257706

gnupg2 is not in main, ubuntu uses gnupg1 by default.
in vivid, and being fixed in sru's for trusty and utopic, upstart is managing user session and launching gnupg-agent (either gnupg1 or gnome-keyring), ditto ssh-agent (either gnupg1 or gnome-keyring).

To integrate this correctly, support should be added to ssh-agent/gnome-keyring-ssh & gpg-agent/gnome-keyring-gpg to support third alternative, that is gnupg2's gpg-agent and gnupg2's ssh-agent. Patches against that are welcome.

With respect to gpg smartcard, on my machine i've copied gnupg-agent.conf job into ~/.config/upstart/ an tweaked it to export ssh-agent vairable, and also did "echo manual > ~/.config/upstart/ssh-agent.override" and thus i'm using gnupg gpg-agent for both ssh & gpg authentication.