sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak sudo vim /etc/apt/sources.list
2、删除/etc/apt/sources.list文件中的全部内容
增加如下内容
deb http://mirrors.163.com/ubuntu/ precise main restricted deb-src http://mirrors.163.com/ubuntu/ precise main restricted deb http://mirrors.163.com/ubuntu/ precise-updates main restricted deb-src http://mirrors.163.com/ubuntu/ precise-updates main restricted 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 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 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 deb http://extras.ubuntu.com/ubuntu precise main deb-src http://extras.ubuntu.com/ubuntu precise main
3、更新
sudo apt-get update
报错
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 16126D3A3E5C1192
解决:这个非官方源是不可信任的，解决办法是导入该源的公钥
gpg --keyserver subkeys.pgp.net --recv 16126D3A3E5C1192 gpg --export --armor 16126D3A3E5C1192 | sudo apt-key add - sudo apt-get update sudo apt-get upgrade
#deb cdrom:[Ubuntu 14.10 _Utopic Unicorn_ - Release amd64 (20141022.1)]/ utopic main restricted # See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to # newer versions of the distribution. deb http://cn.archive.ubuntu.com/ubuntu/ utopic main restricted deb-src http://cn.archive.ubuntu.com/ubuntu/ utopic main restricted ## Major bug fix updates produced after the final release of the ## distribution. deb http://cn.archive.ubuntu.com/ubuntu/ utopic-updates main restricted deb-src http://cn.archive.ubuntu.com/ubuntu/ utopic-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://cn.archive.ubuntu.com/ubuntu/ utopic universe deb-src http://cn.archive.ubuntu.com/ubuntu/ utopic universe deb http://cn.archive.ubuntu.com/ubuntu/ utopic-updates universe deb-src http://cn.archive.ubuntu.com/ubuntu/ utopic-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://cn.archive.ubuntu.com/ubuntu/ utopic multiverse deb-src http://cn.archive.ubuntu.com/ubuntu/ utopic multiverse deb http://cn.archive.ubuntu.com/ubuntu/ utopic-updates multiverse deb-src http://cn.archive.ubuntu.com/ubuntu/ utopic-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://cn.archive.ubuntu.com/ubuntu/ utopic-backports main restricted universe multiverse deb-src http://cn.archive.ubuntu.com/ubuntu/ utopic-backports main restricted universe multiverse deb http://security.ubuntu.com/ubuntu utopic-security main restricted deb-src http://security.ubuntu.com/ubuntu utopic-security main restricted deb http://security.ubuntu.com/ubuntu utopic-security universe deb-src http://security.ubuntu.com/ubuntu utopic-security universe deb http://security.ubuntu.com/ubuntu utopic-security multiverse deb-src http://security.ubuntu.com/ubuntu utopic-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 utopic partner # deb-src http://archive.canonical.com/ubuntu utopic 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 utopic main deb-src http://extras.ubuntu.com/ubuntu utopic main