How to fix the update error on Debian 12 Bookworm
After a fresh installation of Debian 12 Bookworm, I opened the terminal and typed the following command:
sudo apt-get update
An error comes out. The line that starts with deb cdrom inside /etc/apt/sources.list is the reason behind it.
To fix the error open the /etc/apt/sources.list in editing mode as root and replace its content with the following:
deb http://deb.debian.org/debian bookworm main non-free-firmware
deb-src http://deb.debian.org/debian bookworm main non-free-firmware
deb http://deb.debian.org/debian-security/ bookworm-security main non-free-firmware
deb-src http://deb.debian.org/debian-security bookworm-security main non-free-firmware
deb http://deb.debian.org/debian bookworm-updates main non-free-firmware
deb-src http://deb.debian.org/debian bookworm-updates main non-free-firmware
Then save and type:
sudo apt-get update && sudo apt-get upgrade
Final thoughts
The error is the result of misconfiguration of the repositories inside the /etc/apt/sources.list. An update of the file with the sources that are shared on the official website of the Debian operating system is the solution to the problem.
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