Repositories error?

[UnixLikeNewbie]

I just installed Linux Mint Debian 201109 Gnome 64-bit edition. After changing the repositories using this thread http://forums.linuxmint.com/viewtopic.php?f=185&t=82346 I however receive the folowing error:

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W: Failed to fetch http://packages.linuxmint.com/dists/debian/InRelease  

W: Failed to fetch http://debian.linuxmint.com/latest/dists/testing/InRelease  

W: Failed to fetch http://debian.linuxmint.com/latest/security/dists/testing/updates/InRelease  

W: Failed to fetch http://debian.linuxmint.com/latest/multimedia/dists/testing/InRelease  

W: Failed to fetch http://packages.linuxmint.com/dists/debian/Release.gpg  Could not resolve 'packages.linuxmint.com'

W: Failed to fetch http://debian.linuxmint.com/latest/dists/testing/Release.gpg  Could not resolve 'debian.linuxmint.com'

W: Failed to fetch http://debian.linuxmint.com/latest/security/dists/testing/updates/Release.gpg  Could not resolve 'debian.linuxmint.com'

W: Failed to fetch http://debian.linuxmint.com/latest/multimedia/dists/testing/Release.gpg  Could not resolve 'debian.linuxmint.com'

W: Some index files failed to download. They have been ignored, or old ones used instead.

when trying to use the update manager.

[viking777]

In terminal

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cat /etc/apt/sources.list

Copy, paste and post result please.