Installing latest version of GNU Octave when I have already installed other version

I have installed Gnu Octave by using apt-get install octave.
This installed version 4.0.3 on my machine.

I want to install the latest available version. How can I:

1. Uninstall the version I have?
2. Install the latest version?

Solution 1:

For uninstalling GNU Octave you can run this command:

sudo apt purge octave

But you don't need to remove and then install latest version of Octave.

You can easily upgrade that package with this commands:

sudo add-apt-repository ppa:octave/stable
sudo apt update
sudo apt install octave

These commands upgrade Octave to latest stable version of this software (with no need to remove current version).

Solution 2:

You can run the newest version of Octave (5.1.0 in March 2019) by running it as a Flatpack app. "Flatpack is a system for building, distributing, and running sandboxed desktop applications on Linux."

The installation procedure is described here: https://flathub.org/apps/details/org.octave.Octave at the bottom of the page.

A more complete set of commands looks like the following section:

If you are on Ubuntu 16.04, You have to install flatpack first, then run Octave:

sudo add-apt-repository ppa:alexlarsson/flatpak
sudo apt install flatpak
# optional line, AFAIK (pulls in Gnome deps?):
sudo apt install gnome-software-plugin-flatpak  
# this line possibly required on Debian systems
flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo  
flatpak install flathub org.octave.Octave
flatpak run org.octave.Octave --gui

This downloads about 900 MB from the internet.

For convenience in starting Octave from the command line, you can create the files /usr/share/octave with the contents

#!/bin/sh
flatpak run org.octave.Octave --gui

and /usr/share/octave-cli with content

#!/bin/sh
flatpak run org.octave.Octave