Issue with new Emacs setup in Cygwin

[David Karr]

I've been running Emacs in Cygwin for a long time, but I don't set it up
very often. I'm currently running Emacs v26.3 under what I believe is
Cygwin 3.1.5.

I just installed the latest Cygwin and Emacs, which is v27.2.

I copied my .emacs and some hand-coded packages from the old laptop to the
new one.

When I start Emacs on the new laptop, I get:

    File is missing: Cannot open load file, No such file or directory,
bash-completion

I thought perhaps this would be in the list of available packages, but it
is not.

I am definitely attempting to load "bash-completion" from my .emacs, with:

-------------------------
(require 'bash-completion)
(bash-completion-setup)
---------------------------

I'm not certain what to do to resolve this.