uvt-simplestreams-libvirt sync gpg keyring error

1) % lsb_release -rd
Description: Ubuntu Utopic Unicorn (development branch)
Release: 14.10

2) % apt-cache policy uvtool-libvirt
uvtool-libvirt:
  Installed: 0~bzr92-0ubuntu1
  Candidate: 0~bzr92-0ubuntu1
  Version table:
 *** 0~bzr92-0ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ utopic/universe amd64 Packages
        100 /var/lib/dpkg/status

3) uvt-simplestreams-libvirt sync release=precise arch=amd64 should download the precise amd64 cloud image without errors

4) uvt-simplestreams-libvirt sync release=precise arch=amd64
Traceback (most recent call last):
  File "/usr/bin/uvt-simplestreams-libvirt", line 27, in <module>
    uvtool.libvirt.simplestreams.main()
  File "/usr/lib/python2.7/dist-packages/uvtool/libvirt/simplestreams.py", line 326, in main
    args.func(args)
  File "/usr/lib/python2.7/dist-packages/uvtool/libvirt/simplestreams.py", line 269, in main_sync
    tmirror.sync(smirror, initial_path)
  File "/usr/lib/python2.7/dist-packages/simplestreams/mirrors/__init__.py", line 82, in sync
    content, payload = reader.read_json(path)
  File "/usr/lib/python2.7/dist-packages/simplestreams/mirrors/__init__.py", line 40, in read_json
    return raw, self.policy(content=raw, path=path)
  File "/usr/lib/python2.7/dist-packages/uvtool/libvirt/simplestreams.py", line 258, in policy
    content, keyring=args.keyring)
  File "/usr/lib/python2.7/dist-packages/simplestreams/util.py", line 271, in read_signed
    raise e
subprocess.CalledProcessError: Command '['gpg', '--batch', '--verify', u'--keyring=/usr/share/keyrings/ubuntu-cloudimage-keyring.gpg', '-']' returned non-zero exit status 2

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: uvtool-libvirt 0~bzr92-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.2-0ubuntu4
Architecture: amd64
Date: Wed May 21 09:13:58 2014
InstallationDate: Installed on 2014-05-20 (1 days ago)
InstallationMedia: Ubuntu-Server 14.10 "Utopic Unicorn" - Alpha amd64 (20140515)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: uvtool
UpgradeStatus: No upgrade log present (probably fresh install)