emacs を install

sudo apt install emacs

できない場合, 一度アップデートしてから

sudo apt-get update
sudo apt install emacs

emacs の version チェックは

emacs -version

例

> emacs -version
GNU Emacs 26.1
Copyright (C) 2018 Free Software Foundation, Inc.
GNU Emacs comes with ABSOLUTELY NO WARRANTY.
You may redistribute copies of GNU Emacs
under the terms of the GNU General Public License.
For more information about these matters, see the file named COPYING.

emacs の version は 26.1 ということがわかる.

source ~/grad_members_20f/members/djj31370/emacs.org