Depurar apt / Install Docker - No se puede localizar el paquete docker-ce

he seguido instrucciones oficiales para la instalación de Docker - Debian Jessie.

• En /etc/apt/sources.list dice ahora,

  deb [arch=amd64] https://download.docker.com/linux/debian jessie stable

• apt-get update parece descargar paquetes correctamente (salida abajo)

• pero luego, en apt-get install docker-ce, el sistema informa que "no se puede localizar el paquete docker-ce".

¿Cómo puedo depurar lo que está pasando? Nunca he tenido esto antes.

Salida de apt-get update:

Hit http://packages.dotdeb.org jessie InRelease
Hit http://security.debian.org jessie/updates InRelease
Hit http://packages.dotdeb.org jessie/all Sources
Hit http://security.debian.org jessie/updates/main Sources
Hit http://security.debian.org jessie/updates/contrib Sources
Hit http://packages.dotdeb.org jessie/all i386 Packages
Hit http://security.debian.org jessie/updates/main i386 Packages
Hit http://security.debian.org jessie/updates/contrib i386 Packages
Hit http://security.debian.org jessie/updates/contrib Translation-en
Hit https://download.docker.com jessie InRelease
Hit http://security.debian.org jessie/updates/main Translation-en
Ign http://http.debian.net jessie InRelease
Hit https://download.docker.com jessie/stable amd64 Packages
Hit http://http.debian.net jessie-updates InRelease
Hit http://http.debian.net jessie Release.gpg
Get:1 https://download.docker.com jessie/stable Translation-en_US [587 B]
Ign http://packages.dotdeb.org jessie/all Translation-en_US
Ign http://packages.dotdeb.org jessie/all Translation-en
Hit http://http.debian.net jessie-updates/main Sources
Get:2 https://download.docker.com jessie/stable Translation-en [584 B]
Hit http://http.debian.net jessie-updates/contrib Sources
Get:3 https://download.docker.com jessie/stable Translation-en_US [587 B]
Get:4 http://http.debian.net jessie-updates/main i386 Packages/DiffIndex [8,884 B]
Get:5 https://download.docker.com jessie/stable Translation-en [584 B]
Hit http://http.debian.net jessie-updates/contrib i386 Packages
Hit http://http.debian.net jessie-updates/contrib Translation-en
Get:6 https://download.docker.com jessie/stable Translation-en_US [587 B]
Get:7 http://http.debian.net jessie-updates/main Translation-en/DiffIndex [3,688 B]
Get:8 https://download.docker.com jessie/stable Translation-en [584 B]
Hit http://http.debian.net jessie Release
Get:9 https://download.docker.com jessie/stable Translation-en_US [587 B]
Hit http://http.debian.net jessie/main Sources
Get:10 https://download.docker.com jessie/stable Translation-en [584 B]
Hit http://http.debian.net jessie/contrib Sources
Hit http://http.debian.net jessie/main i386 Packages
Get:11 https://download.docker.com jessie/stable Translation-en_US [587 B]
Ign https://download.docker.com jessie/stable Translation-en_US
Hit http://http.debian.net jessie/contrib i386 Packages
Hit http://http.debian.net jessie/contrib Translation-en
Hit http://http.debian.net jessie/main Translation-en
Get:12 https://download.docker.com jessie/stable Translation-en [584 B]
Ign https://download.docker.com jessie/stable Translation-en

Instalar docker-ce en Debian Jessie:

Después de agregar deb [arch=amd64] https://download.docker.com/linux/debian jessie stable para usted /etc/sources.list. (no necesitas el software-properties-common paquete o el add-apt-repository mando)

Instale el paquete requerido:

sudo apt-get update
sudo apt-get install apt-transport-https ca-certificates curl

Añade el gpg llave:

curl -fsSl https://download.docker.com/linux/debian/gpg | sudo apt-get key add -

Actualizar y buscar docker-ce paquete:

sudo apt-get update
apt-cache search docker-ce

Luego instale el docker-ce paquete:

sudo apt-get install docker-ce