How to Configure apt

Debian 11 bullseye

Error:

$ sudo apt update

Ign:1 cdrom://[Debian GNU/Linux 11.0.0 Bullseye – Official amd64 DVD Binary-1 20210814-10:04] bullseye InRelease
Err:2 cdrom://[Debian GNU/Linux 11.0.0 Bullseye – Official amd64 DVD Binary-1 20210814-10:04] bullseye Release
Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Hit:3 http://deb.debian.org/debian bullseye InRelease
Hit:4 http://security.debian.org/debian-security bullseye-security InRelease
Hit:5 http://httpredir.debian.org/debian stable InRelease
Get:6 http://deb.debian.org/debian bullseye-updates InRelease [36.8 kB]
Reading package lists… Done
E: The repository ‘cdrom://[Debian GNU/Linux 11.0.0 Bullseye – Official amd64 DVD Binary-1 20210814-10:04] bullseye Release’ does not have a Release file.
N: Updating from such a repository can’t be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

Configurations:

To resolve “apt” problem you have to edit Source file as follow:

Configuration:

Open terminal to edit source list file as follow:

$ sudo nano /etc/apt/sources.list

and comment out following line by adding # in the begining of the line:

#deb cdrom:[Debian GNU/Linux 11.0.0 Bullseye – Official amd64 DVD Binary-1 20210814-10:04]/ bullseye contrib>

Now run following apt commands

$ sudo apt update

Hit:1 http://security.debian.org/debian-security bullseye-security InRelease
Hit:2 http://deb.debian.org/debian bullseye InRelease
Hit:3 http://httpredir.debian.org/debian stable InRelease
Hit:4 http://deb.debian.org/debian bullseye-updates InRelease
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
All packages are up to date.

$ sudo apt upgrade

Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.


As you can see from our output "apt" problem is resolve for good

If you think I have missed something or there is batter ways to resolve this problem please share your knowledge in comments. 

Thanks

ZHR