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I have just done a clean installation of debian buster, and I'm having trouble with apt update (I'm posting this question to this community since ubuntu it's just a distribution of debian, so i guessed somebody could help).

UPDATES PROBLEM

I run sudo apt update and I get this

    Ign:1 cdrom://[Debian GNU/Linux 10.1.0 _Buster_ - Official amd64 NETINST 20190908-01:07] buster InRelease
Err:2 cdrom://[Debian GNU/Linux 10.1.0 _Buster_ - Official amd64 NETINST 20190908-01:07] buster 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 buster InRelease              
Ign:4 http://deb.debian.org/debian buster/updates InRelease      
Hit:5 http://deb.debian.org/debian buster-updates InRelease
Err:6 http://deb.debian.org/debian buster/updates Release
  404  Not Found [IP: 151.101.132.204 80]
Reading package lists... Done
E: The repository 'cdrom://[Debian GNU/Linux 10.1.0 _Buster_ - Official amd64 NETINST 20190908-01:07] buster 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.
E: The repository 'http://deb.debian.org/debian buster/updates 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.
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:3 and /etc/apt/sources.list:4
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:3 and /etc/apt/sources.list:4
W: Target Translations (main/i18n/Translation-en_US) is configured multiple times in /etc/apt/sources.list:3 and /etc/apt/sources.list:4
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:3 and /etc/apt/sources.list:4
W: Target DEP-11 (main/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list:3 and /etc/apt/sources.list:4
W: Target DEP-11 (main/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:3 and /etc/apt/sources.list:4
W: Target DEP-11-icons-small (main/dep11/icons-48x48.tar) is configured multiple times in /etc/apt/sources.list:3 and /etc/apt/sources.list:4
W: Target DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:3 and /etc/apt/sources.list:4

Here you have the content of my sources.list

    # 

deb cdrom:[Debian GNU/Linux 10.1.0 _Buster_ - Official amd64 NETINST 20190908-01:07]/ buster main
deb cdrom:[Debian GNU/Linux 10.1.0 _Buster_ - Official amd64 NETINST 20190908-01:07]/ buster main

deb http://deb.debian.org/debian/ buster main
deb-src http://deb.debian.org/debian/ buster main

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

# buster-updates, previously known as 'volatile'
deb http://deb.debian.org/debian/ buster-updates main
deb-src http://deb.debian.org/debian/ buster-updates main

# This system was installed using small removable media
# (e.g. netinst, live or single CD). The matching "deb cdrom"
# entries were disabled at the end of the installation process.
# For information about how to configure apt package sources,
# see the sources.list(5) manual.

I really can't understand what's the problem here, if these are the default sources that came with my clean installation inside the file, I changed nothing.

1

Comment your deb cdrom: lines and comment / remove the lines

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

and replace them with

deb http://deb.debian.org/debian-security/ buster/updates main
deb-src http://deb.debian.org/debian-security/ buster/updates main

I don't know if these repositories were changed, but these are (working) repos taken from the Debian wiki.

Or copy & paste an example source.list from the wiki, here is the one with the additional contrib and non-free repos

deb http://deb.debian.org/debian buster main contrib non-free
deb-src http://deb.debian.org/debian buster main contrib non-free

deb http://deb.debian.org/debian-security/ buster/updates main contrib non-free
deb-src http://deb.debian.org/debian-security/ buster/updates main contrib non-free

deb http://deb.debian.org/debian buster-updates main contrib non-free
deb-src http://deb.debian.org/debian buster-updates main contrib non-free

and run sudo apt update again.

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