thanks for a quick reply guys!!
I have tried apt-get update before but it displays a lots of error
this is it
Err
http://debian.usefulinc.com ./ Packages
Could not resolve 'debian.usefulinc.com'
Hit
http://lpnotfr.free.fr ./ Packages
Err
http://debian.usefulinc.com ./ Release
Could not resolve 'debian.usefulinc.com'
Err
http://hinterhof.net ./ Packages
404 Not Found
Ign
http://hinterhof.net ./ Release
Err
http://hinterhof.net ./ Sources
404 Not Found
Err
http://kanotix.com ./ Packages
404 Not Found
Ign
http://kanotix.com ./ Release
Ign
http://hinterhof.net ./ Release
Get:1
http://ftp.de.debian.org unstable/main Packages [9481kB]
Hit
http://lpnotfr.free.fr ./ Release
Err
http://debian.usefulinc.com ./ Sources
Could not resolve 'debian.usefulinc.com'
Err
http://kanotix.com ./ Sources
404 Not Found
Ign
http://kanotix.com ./ Release
Err
http://sylpheed-claws.sourceforge.net unstable/main Packages
301 Moved Permanently
Ign
http://sylpheed-claws.sourceforge.net unstable/main Release
Err
http://sylpheed-claws.sourceforge.net unstable/main Sources
301 Moved Permanently
Ign
http://sylpheed-claws.sourceforge.net unstable/main Release
Err
http://debian.usefulinc.com ./ Release
Could not resolve 'debian.usefulinc.com'
Hit
http://lpnotfr.free.fr ./ Sources
Hit
http://sectool.sourceforge.net ./ Packages
Ign
http://sectool.sourceforge.net ./ Release
Hit
http://sectool.sourceforge.net ./ Sources
Ign
http://sectool.sourceforge.net ./ Release
Hit
http://www.stanchina.net ./ Packages
Hit
http://www.stanchina.net ./ Release
Hit
http://www.stanchina.net ./ Sources
Hit
http://www.stanchina.net ./ Release
Hit
http://lpnotfr.free.fr ./ Release
Get:2
http://ftp.de.debian.org unstable/main Release [82B]
Get:3
http://ftp.de.debian.org unstable/contrib Packages [77.8kB]
Get:4
http://ftp.de.debian.org unstable/contrib Release [85B]
Hit
http://ftp.de.debian.org unstable/non-free Packages
Get:5
http://ftp.de.debian.org unstable/non-free Release [86B]
Err
http://ftp.de.debian.org unstable/non-US/main Packages
404 Not Found
Ign
http://ftp.de.debian.org unstable/non-US/main Release
Err
http://ftp.de.debian.org unstable/non-US/contrib Packages
404 Not Found
Ign
http://ftp.de.debian.org unstable/non-US/contrib Release
Err
http://ftp.de.debian.org unstable/non-US/non-free Packages
404 Not Found
Ign
http://ftp.de.debian.org unstable/non-US/non-free Release
Get:6
http://ftp.de.debian.org unstable/main Sources [6810kB]
Get:7
http://ftp.de.debian.org unstable/main Release [84B]
Get:8
http://ftp.de.debian.org unstable/contrib Sources [58.3kB]
Get:9
http://ftp.de.debian.org unstable/contrib Release [87B]
Hit
http://ftp.de.debian.org unstable/non-free Sources
Get:10
http://ftp.de.debian.org unstable/non-free Release [88B]
Err
http://ftp.de.debian.org unstable/non-US/main Sources
404 Not Found
Ign
http://ftp.de.debian.org unstable/non-US/main Release
Err
http://ftp.de.debian.org unstable/non-US/contrib Sources
404 Not Found
Ign
http://ftp.de.debian.org unstable/non-US/contrib Release
Err
http://ftp.de.debian.org unstable/non-US/non-free Sources
404 Not Found
Ign
http://ftp.de.debian.org unstable/non-US/non-free Release
Get:11
http://ftp.de.debian.org testing/main Packages [9058kB]
Get:12
http://ftp.de.debian.org testing/main Release [81B]
Get:13
http://ftp.de.debian.org testing/contrib Packages [72.8kB]
Get:14
http://ftp.de.debian.org testing/contrib Release [84B]
Hit
http://ftp.de.debian.org testing/non-free Packages
Get:15
http://ftp.de.debian.org testing/non-free Release [85B]
Err
http://ftp.de.debian.org testing/non-US/main Packages
404 Not Found
Ign
http://ftp.de.debian.org testing/non-US/main Release
Err
http://ftp.de.debian.org testing/non-US/contrib Packages
404 Not Found
Ign
http://ftp.de.debian.org testing/non-US/contrib Release
Err
http://ftp.de.debian.org testing/non-US/non-free Packages
404 Not Found
Ign
http://ftp.de.debian.org testing/non-US/non-free Release
Get:16
http://ftp.de.debian.org testing/main Sources [6142kB]
Get:17
http://ftp.de.debian.org testing/main Release [83B]
Get:18
http://ftp.de.debian.org testing/contrib Sources [53.4kB]
Get:19
http://ftp.de.debian.org testing/contrib Release [86B]
Hit
http://ftp.de.debian.org testing/non-free Sources
Get:20
http://ftp.de.debian.org testing/non-free Release [87B]
Err
http://ftp.de.debian.org testing/non-US/main Sources
404 Not Found
Ign
http://ftp.de.debian.org testing/non-US/main Release
Err
http://ftp.de.debian.org testing/non-US/contrib Sources
404 Not Found
Ign
http://ftp.de.debian.org testing/non-US/contrib Release
Err
http://ftp.de.debian.org testing/non-US/non-free Sources
404 Not Found
Ign
http://ftp.de.debian.org testing/non-US/non-free Release
Fetched 31.8MB in 23m45s (22.3kB/s)
Failed to fetch
http://debian.usefulinc.com/gnome/./Packages.gz Could not resolve 'debian.usefulinc.com'
Failed to fetch
http://debian.usefulinc.com/gnome/./Release Could not resolve 'debian.usefulinc.com'
Failed to fetch
http://debian.usefulinc.com/gnome/./Sources.gz Could not resolve 'debian.usefulinc.com'
Failed to fetch
http://debian.usefulinc.com/gnome/./Release Could not resolve 'debian.usefulinc.com'
Failed to fetch
http://ftp.de.debian.org/debian-non-...86/Packages.gz 404 Not Found
Failed to fetch
http://ftp.de.debian.org/debian-non-...86/Packages.gz 404 Not Found
Failed to fetch
http://ftp.de.debian.org/debian-non-...86/Packages.gz 404 Not Found
Failed to fetch
http://ftp.de.debian.org/debian-non-...rce/Sources.gz 404 Not Found
Failed to fetch
http://ftp.de.debian.org/debian-non-...rce/Sources.gz 404 Not Found
Failed to fetch
http://ftp.de.debian.org/debian-non-...rce/Sources.gz 404 Not Found
Failed to fetch
http://ftp.de.debian.org/debian-non-...86/Packages.gz 404 Not Found
Failed to fetch
http://ftp.de.debian.org/debian-non-...86/Packages.gz 404 Not Found
Failed to fetch
http://ftp.de.debian.org/debian-non-...86/Packages.gz 404 Not Found
Failed to fetch
http://ftp.de.debian.org/debian-non-...rce/Sources.gz 404 Not Found
Failed to fetch
http://ftp.de.debian.org/debian-non-...rce/Sources.gz 404 Not Found
Failed to fetch
http://ftp.de.debian.org/debian-non-...rce/Sources.gz 404 Not Found
Failed to fetch
http://sylpheed-claws.sourceforge.ne...86/Packages.gz 301 Moved Permanently
Failed to fetch
http://sylpheed-claws.sourceforge.ne...rce/Sources.gz 301 Moved Permanently
Failed to fetch
http://hinterhof.net/~max/debian/./Packages.gz 404 Not Found
Failed to fetch
http://hinterhof.net/~max/debian/./Sources.gz 404 Not Found
Failed to fetch
http://kanotix.com/files/debian/./Packages.gz 404 Not Found
Failed to fetch
http://kanotix.com/files/debian/./Sources.gz 404 Not Found
Reading Package Lists... Error!
E: Unable to parse package file /var/lib/apt/lists/ftp.de.debian.org_debian_dists_unstable_main_binary-i386_Packages (1)
E: The package lists or status file could not be parsed or opened.
error in reading package=>I couldn't figure it out