Objective

This article explains a system upgrade procedure from Debian 9 Stretch Linux to Debian 10 Buster.

What's New

  • UEFI Secure Boot
  • AppArmor enabled per default
  • Optional hardening of APT
  • Unattended-upgrades for stable point releases
  • Substantially improved man pages for German speaking users
  • Network filtering based on nftables framework by default
  • Cryptsetup defaults to on-disk LUKS2 format
  • driverless printing with CUPS 2.2.10
  • Basic support for Allwinner A64 based devices
SOURCE: debian.org
Debian 10 Buster Linux System
Debian 10 Buster Linux System

Preparations

WARNING
Given that the Debian is an extremely robust Linux distribution, combined with the fact that there is nothing certain in life, the chances are, that after the upgrade you may end up with a broken system. Therefore, it is necessary to point out that no system upgrade is bulletproof and you should discuss, prepare and possibly test any proper fail-over or recovery process prior the proposed system upgrade to Debian Buster. For a more robust or production systems, you are recommended to read the official Debian upgrade guide before proceeding.
The rule of thumb is, the less software installed on your system, the higher chance for a successful upgrade. The chances for a successful and fully functional upgrade are decreased by a number of 3rd-party packages installed on your current system. From this reason, remove any obsolete standard repository and 3rd-party software before you attempt the upgrade. The aptitude command might help you to find any 3rd party software package currently installed on your Debian system.
# aptitude search '~i(!~ODebian)'
The above command will list all packages which are no longer in a standard repository list since they were removed; thus they were rendered obsolete, or the 3rd party packages which were installed manually.

Perform a full backup of data and manual configuration files residing on your current system. For example, these may include but not limited to user home directories, databases, websites, etc. In case you run Debian Linux virtually take a snapshot just in case something goes wrong during the Buster upgrade.


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Buster Full Upgrade

Before we move on with the upgrade, let's fully upgrade our current Debian Jessie system:
# apt-get update
# apt-get upgrade
# apt-get dist-upgrade
If everything went smoothly, perform database sanity and consistency checks for partially installed, missing and obsolete packages:
# dpkg -C
If no issues are reported, check what packages are held back:
# apt-mark showhold
Packages On Hold will not be upgraded, which may cause inconsistencies after Buster upgrade. Before you move to the next part, it is recommended to fix all issues produced by both above commands. The following command might be of a further assistance:
# dpkg --audit

Update Package Repository to Debian Buster

Now, that we have a current system fully upgraded, it is time to re-synchronize the package index files with new Debian Buster sources. This is done by editing /etc/apt/sources.list file to include Debian stretch package repository. First, make a backup the current /etc/apt/sources.list:
# cp /etc/apt/sources.list /etc/apt/sources.list_backup
Execute apt edit-sources or use your favourite text editor e.g., VIM to modify a current /etc/apt/sources.list file to include stretch repositories. Simply update keyword stretch to buster.

Example:
FROM STRECTH:
deb http://httpredir.debian.org/debian stretch main
deb http://httpredir.debian.org/debian stretch-updates main
deb http://security.debian.org stretch/updates main

TO BUSTER:
deb http://httpredir.debian.org/debian buster main
deb http://httpredir.debian.org/debian buster-updates main
deb http://security.debian.org buster/updates main
Alternatively, use a sed command to automate this tedious task:
# sed -i 's/stretch/buster/g' /etc/apt/sources.list
Once the above /etc/apt/sources.list file edit is completed, use apt-get command to update packages index:
# apt update

Upgrade to Debian Buster Simulation

Before we hit the UPGRADE button, let's use apt command to see a preview of what we are facing. To do this execute apt list --upgradable command in order to get a quick survey of the number of packages to be installed, updated and removed without affecting the system.
# apt list --upgradable


Upgrade to Debian Buster

We have come to the most exciting part, which is the actual Stretch upgrade to Debian Buster system. During the upgrade you may be asked:

There are services installed on your system which need to be restarted when certain libraries, such as libpam, libc, and libssl, are upgraded. Since these restarts may cause interruptions of service for the system, you will normally be prompted on each upgrade for the list of services you wish to restart. You can choose this option to avoid being prompted; instead, all necessary restarts will be done for you automatically so you can avoid being asked questions on each library upgrade.

Restart services during package upgrades without asking?
The choice is about whether you wish the system to restart your services automatically during the system upgrade or you wish to do it manually or after the system is fully upgrade to Buster. When ready, execute the bellow commands to commence the Debian Buster upgrade process:
# apt-get upgrade
# apt-get dist-upgrade
At this stage you should have your Stretch Debian Linux system fully upgraded to Debian Buster 10. Follow, this guide to check your current Debian version. Once again check for obsolete packages so there are no surprises down the track:
# aptitude search '~i(!~ODebian)'
Congratulations to your fully upgraded Debian 9 Stretch Linux system.
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