Emacs Does Not Start on Linuxmint

Although the instructions on the referenced page specify emacs-nox as the package name, repository the correct package name is emacs25-nox The reason why it does not start may be that the installation has not been completed in the first place, so please run which emacs to see if the installation is complete.

If you are installing any packages, you should check apt search for the correct package name or make sure that the package exists.In this case, emacs and emacs-nox existed in the official repository without specifying an additional PPA.

The environment I tried was a little older Linux Mint 17.3, but

$sudo apt seachemacs

You can see from the list that emacs23-nox or emacs24-nox is the console version of the package name.After this

$sudo apt install emacs24-nox

The desired package was installed by running and you could check from the console to emacs.
(The version number will vary depending on the running environment, so please check the actual environment and read it again.)

Also, when you ask a question, you should see some kind of message when you install or start a command, so I think it would be easier to get an answer if you included that message in the questionnaire.