Add Debian 11 Bullseye official repositories to sources.list

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After the installation of Debian 11 Bullseye on a Virtualized Infrastructure or a physical machine you’ll notice APT repositories are not configured correctly. These issue doesn’t apply to Cloud images which have repositories for Debian 11 (Bullseye) configured correctly. In this guide we will show you how to add Debian 11 Bullseye Official repositories to sources.list.

If you attempt APT repository update you’ll get an error as shown in the screenshot.

add-debian-11-bullseye-apt-repositories-2048x764

The remedy to this problem is correctly updating sources.list file with Debian 11 (Bullseye) default update and security repositories.

Current file contents:

$ cat /etc/apt/sources.list
# deb cdrom:[Debian GNU/Linux 11.0.0 _Bullseye_ - Official amd64 DVD Binary-1 20210814-10:04]/ bullseye contrib main

deb cdrom:[Debian GNU/Linux 11.0.0 _Bullseye_ - Official amd64 DVD Binary-1 20210814-10:04]/ bullseye contrib main

deb http://security.debian.org/debian-security bullseye-security main contrib
deb-src http://security.debian.org/debian-security bullseye-security main contrib

# bullseye-updates, to get updates before a point release is made;
# see https://www.debian.org/doc/manuals/debian-reference/ch02.en.html#_updates_and_backports
# A network mirror was not selected during install.  The following entries
# are provided as examples, but you should amend them as appropriate
# for your mirror of choice.
#
# deb http://deb.debian.org/debian/ bullseye-updates main contrib
# deb-src http://deb.debian.org/debian/ bullseye-updates main contrib

Add Debian 11 Bullseye Official repositories to sources.list

Run the commands below to add Debian 11 Bullseye Official repositories to sources.list

sudo tee /etc/apt/sources.list<
deb http://deb.debian.org/debian bullseye main
deb-src http://deb.debian.org/debian bullseye main

deb http://security.debian.org/debian-security bullseye-security main
deb-src http://security.debian.org/debian-security bullseye-security main

deb http://deb.debian.org/debian bullseye-updates main
deb-src http://deb.debian.org/debian bullseye-updates main

deb http://deb.debian.org/debian bullseye-backports main
deb-src http://deb.debian.org/debian bullseye-backports main
EOF

When done, update your APT index to confirm the repositories are working correctly:

$ sudo apt update
Get:1 http://deb.debian.org/debian bullseye InRelease [113 kB]
Get:2 http://security.debian.org/debian-security bullseye-security InRelease [44.1 kB]
Get:3 http://deb.debian.org/debian bullseye-updates InRelease [36.8 kB]
Get:4 http://deb.debian.org/debian bullseye-backports InRelease [40.9 kB]
Get:5 http://security.debian.org/debian-security bullseye-security/main Sources [15.8 kB]
Get:6 http://security.debian.org/debian-security bullseye-security/main amd64 Packages [31.1 kB]
Get:7 http://security.debian.org/debian-security bullseye-security/main Translation-en [16.8 kB]
Get:8 http://deb.debian.org/debian bullseye/main Sources [8612 kB]
Get:9 http://deb.debian.org/debian bullseye/main amd64 Packages [8178 kB]
Get:10 http://deb.debian.org/debian bullseye/main Translation-en [6241 kB]
Get:11 http://deb.debian.org/debian bullseye-backports/main Sources [49.8 kB]
Get:12 http://deb.debian.org/debian bullseye-backports/main amd64 Packages [68.7 kB]
Get:13 http://deb.debian.org/debian bullseye-backports/main Translation-en [50.5 kB]
Fetched 23.5 MB in 5s (4978 kB/s)
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
3 packages can be upgraded. Run 'apt list --upgradable' to see them.

Update System

With the official OS repositories added and confirmed to be working let’s update the system packages:

sudo apt upgrade

You can also try distribution minor upgrades if available

sudo apt dist-upgrade

Also install common OS administration tools

sudo apt install git curl bash-completion wget curl vim telnet -y

You now have correct sources.list file on your Debian 11 (Bullseye( system.

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