All commit signatures invalid?

[Ben Finney]

Howdy all,

I'm glad to learn of the ‘verify-signatures’ command, new in Bazaar 2.5.

Less pleasant is that, on a repository where I recently performed ‘bzr
sign-my-commits’ with the same version of Bazaar, it reports all
signatures invalid:

=====
$ bzr verify-signatures
0 commits with valid signatures
0 commits with key now expired
0 commits with unknown keys
108 commits not valid
3968 commits not signed
=====

The ‘$HOME/.bzr.log’ doesn't contain any more information about this.
How can I know why those signatures are being reported as invalid?

-- 
 \      “I am too firm in my consciousness of the marvelous to be ever |
  `\       fascinated by the mere supernatural …” —Joseph Conrad, _The |
_o__)                                                     Shadow-Line_ |
Ben Finney