Which debian buster-backports or bullseye-backports for testing package should be selected when current version is stable buster

we know to upgrade current version below lines should be written in sources.list file:

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

but it is a bit confusing which debian testing packages should be obtained

deb http://ftp.debian.org/debian buster-backports main


deb http://ftp.debian.org/debian bullseye-backports main 

Please clearly explain.

1 Answer 1


On debian stable (buster) you need to use buster-backports, backports contain a recompiled packages from debian testing for debian stable, testing doesn't have a backports repository. In other word bullseye-backports will be released when bullseye will be stable.

  • just receive from a sloppy instruction page saying: debian bullseye-backports
    – user458305
    Feb 28, 2021 at 12:09

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