怎么用apt-get update更新不了源

siberfei

RT RT怎么用apt-get update更新不了源
以下是我的sources.list
#

# deb cdrom:[Ubuntu-Server 12.04 LTS _Precise Pangolin_ - Release amd64 (20120424.1)]/ dists/precise/main/binary-i386/
# deb cdrom:[Ubuntu-Server 12.04 LTS _Precise Pangolin_ - Release amd64 (20120424.1)]/ dists/precise/restricted/binary-i386/
# deb cdrom:[Ubuntu-Server 12.04 LTS _Precise Pangolin_ - Release amd64 (20120424.1)]/ precise main restricted

#deb cdrom:[Ubuntu-Server 12.04 LTS _Precise Pangolin_ - Release amd64 (20120424.1)]/ dists/precise/main/binary-i386/
#deb cdrom:[Ubuntu-Server 12.04 LTS _Precise Pangolin_ - Release amd64 (20120424.1)]/ dists/precise/restricted/binary-i386/
#deb cdrom:[Ubuntu-Server 12.04 LTS _Precise Pangolin_ - Release amd64 (20120424.1)]/ precise main restricted

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://mirrors.163.com/ubuntu/ precise main restricted
deb-src http://mirrors.163.com/ubuntu/ precise main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://mirrors.163.com/ubuntu/ precise-updates main restricted
deb-src http://mirrors.163.com/ubuntu/ precise-updates main restricted
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
deb http://mirrors.163.com/ubuntu/ precise universe
deb-src http://mirrors.163.com/ubuntu/ precise universe
deb http://mirrors.163.com/ubuntu/ precise-updates universe
deb-src http://mirrors.163.com/ubuntu/ precise-updates universe
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://mirrors.163.com/ubuntu/ precise multiverse
deb-src http://mirrors.163.com/ubuntu/ precise multiverse
deb http://mirrors.163.com/ubuntu/ precise-updates multiverse
deb-src http://mirrors.163.com/ubuntu/ precise-updates multiverse
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://mirrors.163.com/ubuntu/ precise-backports main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ precise-backports main restricted universe multiverse

deb http://mirrors.163.com/ubuntu/ precise-security main restricted
deb-src http://mirrors.163.com/ubuntu/ precise-security main restricted
deb http://mirrors.163.com/ubuntu/ precise-security universe
deb-src http://mirrors.163.com/ubuntu/ precise-security universe
deb http://mirrors.163.com/ubuntu/ precise-security multiverse
deb-src http://mirrors.163.com/ubuntu/ precise-security multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
deb http://extras.ubuntu.com/ubuntu precise main
deb-src http://extras.ubuntu.com/ubuntu precise main
## Uncomment the following two lines to add software from Ubuntu's
## 'extras' repository.
## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
错误提示如下
Err http://mirrors.163.com precise InRelease
  
Err http://extras.ubuntu.com precise InRelease
  
Err http://mirrors.163.com precise-updates InRelease
  
Err http://mirrors.163.com precise-backports InRelease
  
Err http://mirrors.163.com precise-security InRelease
  
Err http://extras.ubuntu.com precise Release.gpg                    
  Temporary failure resolving 'extras.ubuntu.com'
Err http://mirrors.163.com precise Release.gpg                     
  Temporary failure resolving 'mirrors.163.com'
Err http://mirrors.163.com precise-updates Release.gpg
  Temporary failure resolving 'mirrors.163.com'
Err http://mirrors.163.com precise-backports Release.gpg
  Temporary failure resolving 'mirrors.163.com'
Err http://mirrors.163.com precise-security Release.gpg
  Temporary failure resolving 'mirrors.163.com'
Reading package lists... Done     
W: Failed to fetch http://mirrors.163.com/ubuntu/dists/precise/InRelease  

W: Failed to fetch http://mirrors.163.com/ubuntu/dists/precise-updates/InRelease  

W: Failed to fetch http://mirrors.163.com/ubuntu/dists/precise-backports/InRelease  

W: Failed to fetch http://mirrors.163.com/ubuntu/dists/precise-security/InRelease  

W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/precise/InRelease  

W: Failed to fetch http://mirrors.163.com/ubuntu/dists/precise/Release.gpg  Temporary failure resolving 'mirrors.163.com'

W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/precise/Release.gpg  Temporary failure resolving 'extras.ubuntu.com'

W: Failed to fetch http://mirrors.163.com/ubuntu/dists/precise-updates/Release.gpg  Temporary failure resolving 'mirrors.163.com'

W: Failed to fetch http://mirrors.163.com/ubuntu/dists/precise-backports/Release.gpg  Temporary failure resolving 'mirrors.163.com'

W: Failed to fetch http://mirrors.163.com/ubuntu/dists/precise-security/Release.gpg  Temporary failure resolving 'mirrors.163.com'

W: Some index files failed to download. They have been ignored, or old ones used instead.
ubuntu装的是服务器版 貌似木有图形界面 肿么改啊 apt-get install也装不了软件