우분투 12.04 서버 apt-get update 에러?

우분투 12.04 서버 버전에 php, mysql, apache를 설치할려고 apt-get update를 한번 했습니다. 근데 이렇게 나오네요.

Err http://kr.archive.ubuntu.com precise InRelease

Err http://security.ubuntu.com precise-security InRelease

Err http://kr.archive.ubuntu.com precise-updates InRelease

Err http://kr.archive.ubuntu.com precise-backports InRelease

Err http://security.ubuntu.com precise-security Release.gpg
Temporary failure resolving ‘security.ubuntu.com
Err http://kr.archive.ubuntu.com precise Release.gpg
Temporary failure resolving ‘kr.archive.ubuntu.com
Err http://kr.archive.ubuntu.com precise-updates Release.gpg
Temporary failure resolving ‘kr.archive.ubuntu.com
Err http://kr.archive.ubuntu.com precise-backports Release.gpg
Temporary failure resolving ‘kr.archive.ubuntu.com
Reading package lists… Done
W: Failed to fetch http://kr.archive.ubuntu.com/ubuntu/dis … /InRelease

W: Failed to fetch http://kr.archive.ubuntu.com/ubuntu/dis … /InRelease

W: Failed to fetch http://kr.archive.ubuntu.com/ubuntu/dis … /InRelease

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists … /InRelease

W: Failed to fetch http://kr.archive.ubuntu.com/ubuntu/dis … elease.gpg Temporary failure resolving ‘kr.archive.ubuntu.com

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists … elease.gpg Temporary failure resolving ‘security.ubuntu.com

W: Failed to fetch http://kr.archive.ubuntu.com/ubuntu/dis … elease.gpg Temporary failure resolving ‘kr.archive.ubuntu.com

W: Failed to fetch http://kr.archive.ubuntu.com/ubuntu/dis … elease.gpg Temporary failure resolving ‘kr.archive.ubuntu.com

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

혹시나 해서
[root@~ 06:00:03]$apt-get install php
Reading package lists… Done
Building dependency tree
Reading state information… Done
E: Unable to locate package php
[root@~ 06:00:07]$

[root@~ 06:01:02]$apt-get install php5
Reading package lists… Done
Building dependency tree
Reading state information… Done
E: Unable to locate package php5
[root@~ 06:01:04]$
이렇게 해보았는데도 안 되네요? 뭐가 잘못된건가요? 혹시 우분투에서 12.04 버전의 소스리스트를 어떻게 한 건가요??
아니면 다른방법이 잇는지요?

네임서버가 초기화 되서 그럴수 있을듯 싶습니다.

http://realizm.tistory.com/67