Upgrade Debian 9 to Debian 10 Buster

1. Backup your system. Typically I create a snapshot.

2. Update existing packages and reboot the Debian 9.x system.

3. Edit the file /etc/apt/sources.list using a text editor and replace each instance of stretch with buster.

4. Update the packages index on Debian Linux, run: sudo apt update

5. Prepare for the operating system upgrade, run: sudo apt upgrade

6. Finally, update Debian 9 to Debian 10 buster by running: sudo apt full-upgrade

7. Reboot the Linux system so that you can boot into Debian 10 Buster

8. Verify that everything is working correctly.

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