Install Emacs in Ubuntu 18.04, 20.04.md

sudo add-apt-repository ppa:kelleyk/emacs

sudo apt update

For user interfaces

sudo apt install emacs27 #This is with an user interface.

or

sudo apt install emacs27-nox #This is with terminal-based.

Remove

sudo apt remove --autoremove emacs27

sudo apt purge emacs27

sudo apt remove --autoremove emacs27-nox

sudo apt purge emacs27-nox