On Fri, 20 Jun 2014 14:21:52 -0400
George Avrunin wrote:
It can also occur with BackupPC when keyless ssh isn't set up
right
and ssh is giving a prompt (e.g., on the first ssh login to a host). Has
happened to me more than once...
Yea, that's the reason you find everywhere when googling, which
is why it took me forever to figure out the version incompatibility
that gives the same error :-).