emacs locked file problem

["Blair, Charles E III" <c-blair@illinois.edu>]

   I have just installed jessie (stable) on my laptop.
The only user (apart from root) is "ceblair".  I think
I got emacs from aptitude, but perhaps it was already
part of the default installation.

   Whenever I try to open or save a file, I get a
message that the file is locked.  I can use the "s"
option to steal the file and proceed, but would
prefer not to have to do this.

   Perhaps a symptom is that, during an emacs
session, the top of the window says
"emacs@debian.c-blair@..." (my e-mail address)
instead of "emacs@ceblair".  I may have made
a mistake during the installation in specifying
my host name or something similar.

   Thanks, as always, for any help.