how to upgrade debian 9 (stretch) to 10 (buster)

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Debian is a popular version, or fork, of the Linux operating system.

The most recently released version is Debian 10, codenamed Buster. The previous version Debian 9 Stretch is officially supported until June 2022. The newer version offers a longer support period and new features, so it is highly recommended to upgrade if running Debian 9.

This tutorial will walk you through how to upgrade from Debian 9 (Stretch) to Debian 10 (Buster).

Step 1: Update Package Manager and Repositories

By default, Debian 9 refers to the repositories designated for Stretch.

1. First, create a backup copy of the /etc/apt/sources.list file:

sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak

2. Then, open the file for editing

sudo nano /etc/apt/sources.list

3. Change all the references in this file from Stretch to Buster. The entries should appear as follows:

deb http://deb.debian.org/debian debian buster main

deb http://deb.debian.org/debian buster-updates main

deb http://deb.debian.org/debian buster/updates main

4. Save the file 

Alternative method:

# sed -i 's/stretch/buster/g' /etc/apt/sources.list

Step 2: Upgrade from Debian 9 to Debian 10

1. Update the local package lists:

sudo apt-get update

2. Next, run updates on the software packages to prepare for the operating system upgrade:

sudo apt-get upgrade

3. Finally, run the distribution upgrade:

sudo apt-get dist-upgrade

4. Once the process completes, reboot the system to boot into Debian 10 Buster:

sudo reboot

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