GPA crashes with "Unsupported certificate"

[Volodya]

When starting (or actually closing also) of GNU Privacy Assistant i get the following:

Title [GPA Error]

The GPGME library returned an unexpected error. The error was:
   Unsupported certificate
This is probably a bug in GPA.
GPA will now try to recover from this error.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: gpa 0.9.4-1
ProcVersionSignature: Ubuntu 3.13.0-37.64-generic 3.13.11.7
Uname: Linux 3.13.0-37-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: amd64
CurrentDesktop: Unity
Date: Thu Oct 16 12:02:14 2014
InstallationDate: Installed on 2014-10-02 (13 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
SourcePackage: gpa
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Volodya (volodya)]

The issue seems to have been resolved after an update for me.

[Andre Heinecke (aheinecke)]

The Problem here is that ubuntu is shipping a gnome-keyring package that is malicoulsly hjacking the GPG_AGENT_INFO environment variable and thus breaking gnupg2 and software (like GPA using it).
For more information about this see: http://wiki.gnupg.org/PlatformNotes

Or the gnome-keyring bugreport:
https://bugs.launchpad.net/ubuntu/+source/gnome-keyring/+bug/884856

If you unset GPG_AGENT_INFO or set it to the real gpg-agent the issue goes away. (At least for me)

[Ted George (tedlz000)]

You can use gpa by using the following command:
env GPG_AGENT_INFO= gpa
Note that there is a space between "=" and "gpa".