Debian says it changed its 'Suite' value from 'stable' to 'oldstable'

I run apt update command and now see something new.

Get:1 http://deb.debian.org/debian buster InRelease [122 kB]
Get:2 http://security.debian.org/debian-security buster/updates InRelease [65.4 kB]          
Get:3 http://deb.debian.org/debian buster-updates InRelease [51.9 kB]                        
Get:4 http://security.debian.org/debian-security buster/updates/main Sources [199 kB]
Get:5 http://security.debian.org/debian-security buster/updates/main amd64 Packages [302 kB]
Get:6 http://security.debian.org/debian-security buster/updates/main Translation-en [158 kB]
Fetched 898 kB in 2s (547 kB/s)                          
Reading package lists... Done
Building dependency tree       
Reading state information... Done
2 packages can be upgraded. Run 'apt list --upgradable' to see them.
N: Repository 'http://deb.debian.org/debian buster InRelease' changed its 'Suite' value from 'stable' to 'oldstable'
N: Repository 'http://security.debian.org/debian-security buster/updates InRelease' changed its 'Suite' value from 'stable' to 'oldstable'
N: Repository 'http://deb.debian.org/debian buster-updates InRelease' changed its 'Suite' value from 'stable-updates' to 'oldstable-updates'

What does buster-updates InRelease' changed its 'Suite' value from 'stable-updates' to 'oldstable-updates' it means? Did someone hacked my system or it is done by Debian on its own?

When a new version of Debian Linux is released, it will change the current stable to oldstable. For example:

  • Debian 10 - stable
  • Debian 11 is released - Now Debian 11 is stable, and Debian 10 is old stable.

It is for your information, and you can safely ignore the message and continue using the apt command or apt-get command as usual:

sudo apt update
sudo apt install foo
sudo apt-get upgrade

Why oldstable Debian Linux?

  1. In a large organisation, it can take a while to plan, test and upgrade all computers.
  2. Some Debian based custom distribution’s stable version can be based on oldstable. Having oldstable is convenient for them too.

When is it released?

The old-stable is “created” just before a new stable is released.

How long will security updates be provided by Debian Linux?

The security team tries to support a stable distribution for about one year after the next stable distribution has been released, except when another stable distribution is released within this year. It is not possible to support three distributions; supporting two simultaneously is already difficult enough.

references:

  1. Chapter 3. Choosing a Debian distribution
  2. Debian -- Debian Releases
  3. LTS - Debian Wiki
  4. Debian Security FAQ
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