Bug#901918: apt: Pinning in /etc/apt/preferences ignored

[Julian Andres Klode <jak@debian.org>]

On Wed, Jun 20, 2018 at 11:41:47AM +0200, Johannes Rohr wrote:
> Package: apt
> Version: 1.6.1
> Severity: important
> 
> I am trying to downgrade unstable to testing, yet my apt pinning is ignored.
> 
> According to /etc/apt/preferences (see below), testing should get 1001 and unstable 60, 
> 
> yet what I see is this:
> 
> 
> xserver-xorg-core:
>   Installiert:           2:1.20.0-2
>   Installationskandidat: 2:1.20.0-2
>   Versionstabelle:
>  *** 2:1.20.0-2 500
>         500 http://deb.debian.org/debian unstable/main amd64 Packages
>         100 /var/lib/dpkg/status
>      2:1.19.6-1 500
>         500 http://deb.debian.org/debian testing/main amd64 Packages
> 
> Therefore I don't get to downgrade.

What does apt-cache policy (without arguments) tell you?

> deb [arch=amd64] http://repo.yandex.ru/yandex-browser/deb beta main
> 
> -- System Information:
> Debian Release: buster/sid
>   APT prefers testing
>   APT policy: (990, 'testing'), (500, 'unstable-debug'), (500, 'testing-debug'), (500, 'unstable')

This policy says something different than your preferences file too

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