In case someone on this list can do something about it: the paradigm of
using emacs on Ubuntu has changed / is broken. The emacs / emacs-nox
packages on all but the latest Ubuntu release appear to be empty.

https://packages.ubuntu.com/xenial/all/emacs/filelist

» Ubuntu <http://www.ubuntu.com/> » Packages <https://packages.ubuntu.com/>
 » xenial <https://packages.ubuntu.com/xenial/all/> » emacs
<https://packages.ubuntu.com/xenial/emacs> » all
<https://packages.ubuntu.com/xenial/all/emacs> » File list
File list of package *emacs* in *xenial* of architecture *all*

/usr/share/doc/emacs/changelog.gz
/usr/share/doc/emacs/copyright