Error resolving http.us.debian.org

I was havng trouble with pppd after building a new 2.4.18 kernel. The version of pppd was pre 2.4 and didn't work. So I got the 2.4 version of pppd and installed it. Rebuilt kernel and my pppd problem went away. I also did an apt-get upgrade. But now I have a new problem. What used to

Error resolving http.us.debian.org

I was havng trouble with pppd after building a new 2.4.18 kernel. The version of pppd was pre 2.4 and didn't work. So I got the 2.4 version of pppd and installed it. Rebuilt kernel and my pppd problem went away. I also did an apt-get upgrade. But now I have a new problem. What used to