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I get the following error when typing:

# apt-get update

W: Failed to fetch  404  Not Found [IP: 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.

Does anyone know how i can fix this?

OS: Debian 7 Wheezy

Linux localhost 3.2.0-1-amd64 #1 SMP Tue Jan 24 05:01:45 UTC 2012 x86_64 GNU/Linux

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Are you sure your OS is Debian 6? Have you installed a newer kernel by yourself? Debian 6 (Squeeze) comes with kernel 2.6.32, upcoming Debian 7 (Wheezy) or Debian testing/unstable has 3.2.0 ... – Janne Pikkarainen May 22 '12 at 8:50
Sorry your right, it is Wheezy – h00j May 22 '12 at 8:52

You try tu use an old (an inexistant !) repository (etch) with the release Wheezy.

Clean your /etc/apt/sources.list. Then, try again apt-get update.

If you yant to install libapache-mod-security, just try :

sudo aptitude install libapache-mod-security
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