How to Upgrade Debian 10 to Debian 11

One of the advantages of the Debian operating system is easy to upgrade to the newer version.

https://youtube.com/watch?v=i_b9_yUmYoQ%3Ffeature%3Doembed

Login to your Debian 10 server using SSH or console. Install all available software updates with the command

apt update && apt upgrade -y

Remove any unused packages

apt autoremove

Change /etc/apt/sources.list

Make a backup of the file

cp /etc/apt/sources.list ~/

Edit the file /etc/apt/sources.list

In the file, change all “buster” entries to “bullseye”. You can do this manually or using sed command

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

Update System

Update repository cache with

apt update

Upgrade software with

apt upgrade

Do a full-upgrade with

apt full-upgrade

Now reboot system

reboot

After reboot, you need to make sure all services running properly, there is a chance some services won’t work as expected, in that case, you need to debug and fix i.