apt-get无法连接
系统：ubuntu 12
我这里用了代理，我已经设置了系统的代理
设置：系统-》网络设置-》
通过浏览器没有问题的，但是apt-get的话，报错，我猜应该是无法连接网络的原因。
问题：
1：按照网上的步骤设置了apt-get，无效。
2：apt-get的代理设置，和系统的代理设置，什么关系？
sgq@sgq-PC-MY18AEZE4:~$ sudo apt-get source timeReading package lists... DoneBuilding dependency treeReading state information... DoneE: You must put some 'source' URIs in your sources.listsgq@sgq-PC-MY18AEZE4:~$ cat /etc/apt/sources.list#deb cdrom:[Ubuntu 12.04 LTS _Precise Pangolin_ - Release i386 (20120423)]/ precise main restricted# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to# newer versions of the distribution.deb http://us.archive.ubuntu.com/ubuntu/ precise main restricteddeb-src http://us.archive.ubuntu.com/ubuntu/ precise main restricted## Major bug fix updates produced after the final release of the## distribution.deb http://us.archive.ubuntu.com/ubuntu/ precise-updates main restricteddeb-src http://us.archive.ubuntu.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## review or updates from the Ubuntu security team.deb http://us.archive.ubuntu.com/ubuntu/ precise universedeb-src http://us.archive.ubuntu.com/ubuntu/ precise universedeb http://us.archive.ubuntu.com/ubuntu/ precise-updates universedeb-src http://us.archive.ubuntu.com/ubuntu/ precise-updates universe## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu## team, and may not be under a free licence. Please satisfy yourself as to## 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://us.archive.ubuntu.com/ubuntu/ precise multiversedeb-src http://us.archive.ubuntu.com/ubuntu/ precise multiversedeb http://us.archive.ubuntu.com/ubuntu/ precise-updates multiversedeb-src http://us.archive.ubuntu.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://us.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiversedeb-src http://us.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiversedeb http://security.ubuntu.com/ubuntu precise-security main restricteddeb-src http://security.ubuntu.com/ubuntu precise-security main restricteddeb http://security.ubuntu.com/ubuntu precise-security universedeb-src http://security.ubuntu.com/ubuntu precise-security universedeb http://security.ubuntu.com/ubuntu precise-security multiversedeb-src http://security.ubuntu.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://archive.canonical.com/ubuntu precise partner# deb-src http://archive.canonical.com/ubuntu precise partner## This software is not part of Ubuntu, but is offered by third-party## developers who want to ship their latest software.deb http://extras.ubuntu.com/ubuntu precise maindeb-src http://extras.ubuntu.com/ubuntu precise mainsgq@sgq-PC-MY18AEZE4:~$ sudo apt-get updateIgn http://extras.ubuntu.com precise InReleaseErr http://extras.ubuntu.com precise Release.gpg Unable to connect to extras.ubuntu.com:http:Ign http://extras.ubuntu.com precise ReleaseIgn http://extras.ubuntu.com precise/main TranslationIndexErr http://extras.ubuntu.com precise/main Sources Unable to connect to extras.ubuntu.com:http:Err http://extras.ubuntu.com precise/main i386 Packages Unable to connect to extras.ubuntu.com:http:Err http://extras.ubuntu.com precise/main Translation-en_US Unable to connect to extras.ubuntu.com:http:Err http://extras.ubuntu.com precise/main Translation-en Unable to connect to extras.ubuntu.com:http:
