gpg: no default secret key: Unusable secret key
gpg: [stdin]: clearsign failed: Unusable secret key
Traceback (most recent call last):
  File "/usr/bin/requestsync", line 248, in <module>
    mailBug(srcpkg, subscribe, status, title, report, options.keyid)
  File "/usr/lib/pymodules/python2.7/ubuntutools/requestsync/mail.py", line 184, in mailBug
    assert gpg.returncode == 0
AssertionError