How to upgrade debian 8 jessie to debian 9 stretch

Two years after the release of Debian 8 "Jessie", the developers of the Debian project have finally released the new Debian 9 "Stretch" operating system, which brings improved support for multiple architectures and hardware components, new applications, and dozens of new features and stability and security improvements.

Here's how to upgrade Debian 8 Jessie to Debian 9 Stretch simply and quickly.

Steps to upgrade Debian 8 Jessie to Debian 9 Stretch

The first thing to have is the latest version of Debian (currently version 8.8), after which you should open a terminal window and type the following:

sudo apt-get update sudo apt-get upgrade sudo apt-get dist-upgrade

After having done this, you must update the software repositories of the distribution, for which you would have to write the following in the terminal:

sudo nano /etc/apt/sources.list

By typing the above, the Nano text editor will open along with the sources.list file with the Debian repositories. In this case, you should change the text of the lines where the word "Jessie" appears and replace it with the word "Stretch". After this, the changes will have to be saved by pressing the Control + O key and then pressing the Control + X combination to exit.

Finally, you must repeat the first step, opening a terminal window and writing the following again:

sudo apt-get update sudo apt-get upgrade sudo apt-get dist-upgrade

After you have done this, the process of upgrading from Debian 8 to the new Debian 9 version will begin.

An alternative to this process would be to use a Debian 9 Stretch ISO image from the debian.org web portal.

In addition, there are also ISO images of Debian 9 Stretch with the GNOME, KDE, Xfce, LXDE, Cinnamon and MATE desktop environments.