Comment 9 for bug 463983

I have such error while installing many packages!!! such as libc6 , ttf-mscorefonts , samba and many more!!!
despite of some comments of many user i think this kind of issue doesnt have any thing related with network bacause when i manually download the package n try to install it the same error occurs !!!
i don't know what's wrong with dpkg in this version but it makes me sick !!!!!

some body help me !!!!!!!!