TVHeadend Server auf Debian Jessie

Hi,
ich möchte einen TVHeadend Server auf Debian Jessie installieren, ich bin dabei nach dieser Anleitung http://ift.tt/1niuftK vorgegangen, allerdings bekomme ich dann folgende Fehlermeldung.

Code:

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sudo apt-get install tvheadend
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package tvheadend

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Hab sowohl stable-4.2 wie auch unstable ausprobiert, immer das gleiche.

Ich bekomme allerdings auch beim sudo apt update eine Meldung wo ich nicht ganz schlau draus werd wie ich die wieder weg bekomme

Code:

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W: The repository 'http://ift.tt/1wb1dRg stretch Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository 'http://ift.tt/2CqSpqg stretch Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
N: Skipping acquire of configured file 'main/binary-armhf/Packages' as repository 'http://ift.tt/1mlyFax stable InRelease' doesn't support architecture 'armhf'
E: Failed to fetch http://ift.tt/2CqSUAE; 404  Not Found [IP: 83.137.145.55 80]
E: Failed to fetch http://ift.tt/2A2pcMp; 404  Not Found [IP: 83.137.145.55 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.

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Danke