Comment 2 for bug 1675925

My first attempt to fix this involved trying to move gpg-agent invocation from upstart to systemd --user. I got that to work by creating:
~/.config/upstart/gpg-agent.override (manual)
~/.config/systemd/user/default.target.wants/gpg-agent.service -> /usr/lib/systemd/user/gpg-agent.service
~/.config/systemd/user/gpg-agent.service.d/override.conf ([Unit]
Before=graphical-session-pre.target)

That correctly started the gpg-agent service, but the environment variables were not visible within a terminal started from gnome-shell. Somehow upstart seems to be the only way for setting env vars, the systemd user service unit does not work as intended. Upstart needs to die. Fast ;-)