Comment 2 for bug 1573619

Searching some more, I found that gpg --decrypt foo-message.txt.gpg
launched in the terminal *will* open the gpg-agent passphrase input window.

So it seems evolution is not calling that the right way.

Checking my /var/log/apt/history.log.1.gz it could be that
things broke with 3.18.5.2-0ubuntu1

Yours,
Steffen