what about jessie backports ?
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> andrew@a68n:~$ ssh root@npc
> Enter passphrase for key '/home/andrew/.ssh/id_ecdsa':
>
> The programs included with the Debian GNU/Linux system are free software;
> the exact distribution terms for each program are described in the
> individual files in /usr/share/doc/*/copyright.
>
> Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
> permitted by applicable law.
> Last login: Mon Mar 25 08:36:11 2019 from a68n.lokal
> root@npc:~# au2
> Get: 1 http://www.deb-multimedia.org jessie InRelease [35.2 kB]
> Get: 2 http://security.debian.org jessie/updates InRelease [44.9
> kB] Get: 3 http://packages.x2go.org jessie InRelease [31.4 kB]
> Ign http://ftp2.de.debian.org jessie
> InRelease Get: 4 http://ftp2.de.debian.org jessie-updates InRelease [7,340
> B] Get: 5 http://www.deb-multimedia.org jessie/main amd64 Packages [95.0
> kB] Get: 6 http://security.debian.org jessie/updates/main amd64 Packages
> [668 kB] Get: 7 http://packages.x2go.org jessie/main amd64 Packages [28.4
> kB] Ign http://ftp2.de.debian.org jessie-backports
> InRelease Get: 8 http://www.deb-multimedia.org jessie/non-free amd64
> Packages [1,948 B] Get: 9 http://www.deb-multimedia.org jessie/main
> Translation-en [38.7 kB] Hit http://ftp2.de.debian.org jessie
> Release.gpg Hit http://www.deb-multimedia.org jessie/non-free
> Translation-en Ign http://ftp2.de.debian.org jessie-backports
> Release.gpg Hit http://security.debian.org jessie/updates/contrib amd64
> Packages Hit http://ftp2.de.debian.org jessie
> Release Ign http://ftp2.de.debian.org jessie-backports
> Release Get: 10 http://security.debian.org jessie/updates/non-free amd64
> Packages [4,556 B] Hit http://ftp2.de.debian.org jessie/main amd64
> Packages Hit http://security.debian.org jessie/updates/contrib
> Translation-en Get: 11 http://security.debian.org jessie/updates/main
> Translation-en [337 kB] Hit http://ftp2.de.debian.org jessie/contrib amd64
> Packages Get: 12 http://security.debian.org jessie/updates/non-free
> Translation-en [11.8 kB] Hit http://ftp2.de.debian.org jessie/non-free
> amd64 Packages Hit http://ftp2.de.debian.org jessie/contrib
> Translation-en Ign http://packages.x2go.org jessie/main Translation-en_GB
> Hit http://ftp2.de.debian.org jessie/main Translation-en
> Ign http://packages.x2go.org jessie/main
> Translation-en Hit http://ftp2.de.debian.org jessie/non-free
> Translation-en Ign http://ftp2.de.debian.org jessie-backports/main amd64
> Packages/DiffIndex Ign http://ftp2.de.debian.org jessie-backports/contrib
> amd64 Packages/DiffIndex Ign http://ftp2.de.debian.org
> jessie-backports/non-free amd64 Packages/DiffIndex Ign
> http://ftp2.de.debian.org jessie-backports/contrib Translation-en_GB Ign
> http://ftp2.de.debian.org jessie-backports/contrib Translation-en Ign
> http://ftp2.de.debian.org jessie-backports/main Translation-en_GB Ign
> http://ftp2.de.debian.org jessie-backports/main Translation-en Ign
> http://ftp2.de.debian.org jessie-backports/non-free Translation-en_GB Ign
> http://ftp2.de.debian.org jessie-backports/non-free Translation-en Err
> http://ftp2.de.debian.org jessie-backports/main amd64 Packages 404 Not
> Found Err http://ftp2.de.debian.org jessie-backports/contrib amd64 Packages
> 404 Not Found
> Err http://ftp2.de.debian.org jessie-backports/non-free amd64 Packages
> 404 Not Found
> Fetched 1,304 kB in 14s (91.6 kB/s)
> W: Failed to fetch
> http://ftp2.de.debian.org/debian/dists/jessie-updates/InRelease: Unable to
> find expected entry 'main/binary-amd64/Packages' in Release file (Wrong
> sources.list entry or malformed file) W: Failed to fetch
> http://ftp2.de.debian.org/debian/dists/jessie-backports/main/binary-amd64/Packages:
> 404 Not Found W: Failed to fetch
> http://ftp2.de.debian.org/debian/dists/jessie-backports/contrib/binary-amd64/Packages:
> 404 Not Found W: Failed to fetch
> http://ftp2.de.debian.org/debian/dists/jessie-backports/non-free/binary-amd64/Packages:
> 404 Not Found E: Some index files failed to download. They have been
> ignored, or old ones used instead. E: Couldn't rebuild package cache
>
> Current status: 67 updates [+57], 1550 new [+8].
> root@npc:~# nano /etc/apt/sources.list
> root@npc:~# au2
> Ign http://ftp2.de.debian.org jessie InRelease
> Hit http://packages.x2go.org jessie InRelease
> Hit http://www.deb-multimedia.org jessie InRelease
> Hit http://security.debian.org jessie/updates InRelease
> Hit http://ftp2.de.debian.org jessie
> Release.gpg Hit http://ftp2.de.debian.org jessie
> Release Hit http://www.deb-multimedia.org jessie/main amd64
> Packages Ign http://debian.org jessie-updates
> InRelease Hit http://www.deb-multimedia.org jessie/non-free amd64
> Packages Hit http://security.debian.org jessie/updates/main amd64
> Packages Hit http://packages.x2go.org jessie/main amd64
> Packages Get: 1 http://ftp2.de.debian.org jessie/contrib Translation-en
> [38.3 kB] Hit http://www.deb-multimedia.org jessie/main
> Translation-en Ign http://debian.org jessie-backports
> InRelease Hit http://security.debian.org jessie/updates/contrib amd64
> Packages Hit http://www.deb-multimedia.org jessie/non-free
> Translation-en Hit http://security.debian.org jessie/updates/non-free amd64
> Packages Get: 2 http://ftp2.de.debian.org jessie/main Translation-en [4,581
> kB] Hit http://security.debian.org jessie/updates/contrib
> Translation-en Ign http://debian.org jessie-updates
> Release.gpg Hit http://security.debian.org jessie/updates/main
> Translation-en Hit http://ftp2.de.debian.org jessie/main amd64
> Packages Hit http://security.debian.org jessie/updates/non-free
> Translation-en Ign http://debian.org jessie-backports
> Release.gpg Hit http://ftp2.de.debian.org jessie/contrib amd64
> Packages Hit http://ftp2.de.debian.org jessie/non-free amd64
> Packages Ign http://debian.org jessie-updates
> Release Hit http://ftp2.de.debian.org jessie/non-free
> Translation-en Ign http://packages.x2go.org jessie/main
> Translation-en_GB Ign http://debian.org jessie-backports
> Release Ign http://packages.x2go.org jessie/main Translation-en
> Err http://debian.org jessie-updates/main amd64
> Packages 406 Not Acceptable
> Err http://debian.org jessie-updates/contrib amd64 Packages
> 406 Not Acceptable
> Err http://debian.org jessie-updates/non-free amd64 Packages
> 406 Not Acceptable
> Ign http://debian.org jessie-updates/contrib Translation-en_GB
> Ign http://debian.org jessie-updates/contrib Translation-en
> Ign http://debian.org jessie-updates/main Translation-en_GB
> Ign http://debian.org jessie-updates/main Translation-en
> Ign http://debian.org jessie-updates/non-free Translation-en_GB
> Ign http://debian.org jessie-updates/non-free Translation-en
> Err http://debian.org jessie-backports/main amd64 Packages
> 406 Not Acceptable
> Err http://debian.org jessie-backports/contrib amd64 Packages
> 406 Not Acceptable
> Err http://debian.org jessie-backports/non-free amd64 Packages
> 406 Not Acceptable
> Ign http://debian.org jessie-backports/contrib Translation-en_GB
> Ign http://debian.org jessie-backports/contrib Translation-en
> Ign http://debian.org jessie-backports/main Translation-en_GB
> Ign http://debian.org jessie-backports/main Translation-en
> Ign http://debian.org jessie-backports/non-free Translation-en_GB
> Ign http://debian.org jessie-backports/non-free Translation-en
> Fetched 4,620 kB in 39s (116 kB/s)
> W: Failed to fetch
> http://debian.org/debian/dists/jessie-updates/main/binary-amd64/Packages:
> 406 Not Acceptable W: Failed to fetch
> http://debian.org/debian/dists/jessie-updates/contrib/binary-amd64/Packages:
> 406 Not Acceptable W: Failed to fetch
> http://debian.org/debian/dists/jessie-updates/non-free/binary-amd64/Packages:
> 406 Not Acceptable W: Failed to fetch
> http://debian.org/debian/dists/jessie-backports/main/binary-amd64/Packages:
> 406 Not Acceptable W: Failed to fetch
> http://debian.org/debian/dists/jessie-backports/contrib/binary-amd64/Packages:
> 406 Not Acceptable W: Failed to fetch
> http://debian.org/debian/dists/jessie-backports/non-free/binary-amd64/Packages:
> 406 Not Acceptable E: Some index files failed to download. They have been
> ignored, or old ones used instead. E: Couldn't rebuild package cache
>
> root@npc:~# exit
> logout
> Connection to npc closed.
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