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[root@host ~]$ sudo apt update
Hit:1 https://ftp.debian.org/debian bullseye InRelease
Hit:2 https://ftp.debian.org/debian bullseye-updates InRelease                                    
Ign:3 https://security.debian.org/debian-security bullseye/updates InRelease                      
Hit:4 https://httpredir.debian.org/debian bullseye InRelease                                      
Err:5 https://security.debian.org/debian-security bullseye/updates Release                        
  404  Not Found [IP: 151.101.66.132 443]
Hit:6 http://download.proxmox.com/debian/ceph-pacific bullseye InRelease                          
Hit:7 http://download.proxmox.com/debian/pve bullseye InRelease            
Hit:8 https://packages.cisofy.com/community/lynis/deb stable InRelease
Reading package lists... Done
E: The repository 'https://security.debian.org/debian-security bullseye/updates Release' does not have a Release file.
N: Updating from such a repository cant be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

cat /etc/apt/sources.list (In cazul asta, e deja modificat; vezi mai jos)

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[root@host ~]$ cat /etc/apt/sources.list
deb https://ftp.debian.org/debian bullseye main contrib
deb https://ftp.debian.org/debian bullseye-updates main contrib
# non-free
deb https://httpredir.debian.org/debian/ bullseye main contrib non-free
# security updates
deb https://security.debian.org/debian-security bullseye-security main contrib

Se modifica:

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

in:

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

Done