不多說，直接上干貨！
寫在前面：筆者由於還在學校學習，學校沒有開發給Linux用的上網客戶端，所以只能用在windows系統中通過安裝虛擬機運行linux比較方便，但沒有外網，只有學校的教育網，所以我需要將ubuntu的默認源修改為教育網中的資源才可以完美運行ubuntu，當然這個教程也適用於修改為非教育源。
- 第一步，備份官方的默認源
避免自己手賤操作失誤，重裝系統太費時間
cp /etc/apt/sources.list /etc/apt/sources.list.bak 此命令是備份該官方源文件
Ubuntu 14.04.4官方默認更新源sources.list
# deb cdrom:[Ubuntu 14.04.4 LTS _Trusty Tahr_ - Release amd64 (20160217.1)]/ trusty 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/ trusty main restricted deb-src http://cn.archive.ubuntu.com/ubuntu/ trusty main restricted ## Major bug fix updates produced after the final release of the ## distribution. deb http://cn.archive.ubuntu.com/ubuntu/ trusty-updates main restricted deb-src http://cn.archive.ubuntu.com/ubuntu/ trusty-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/ trusty universe deb-src http://cn.archive.ubuntu.com/ubuntu/ trusty universe deb http://cn.archive.ubuntu.com/ubuntu/ trusty-updates universe deb-src http://cn.archive.ubuntu.com/ubuntu/ trusty-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/ trusty multiverse deb-src http://cn.archive.ubuntu.com/ubuntu/ trusty multiverse deb http://cn.archive.ubuntu.com/ubuntu/ trusty-updates multiverse deb-src http://cn.archive.ubuntu.com/ubuntu/ trusty-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/ trusty-backports main restricted universe multiverse deb-src http://cn.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse deb http://security.ubuntu.com/ubuntu trusty-security main restricted deb-src http://security.ubuntu.com/ubuntu trusty-security main restricted deb http://security.ubuntu.com/ubuntu trusty-security universe deb-src http://security.ubuntu.com/ubuntu trusty-security universe deb http://security.ubuntu.com/ubuntu trusty-security multiverse deb-src http://security.ubuntu.com/ubuntu trusty-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 trusty partner # deb-src http://archive.canonical.com/ubuntu trusty 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 trusty main deb-src http://extras.ubuntu.com/ubuntu trusty main
Ubuntu 16.04官方默認更新源sources.list
#deb cdrom:[Ubuntu 16.04.1 LTS _Xenial Xerus_ - Release amd64 (20160719)]/ xenial 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/ xenial main restricted # deb-src http://cn.archive.ubuntu.com/ubuntu/ xenial main restricted ## Major bug fix updates produced after the final release of the ## distribution. deb http://cn.archive.ubuntu.com/ubuntu/ xenial-updates main restricted # deb-src http://cn.archive.ubuntu.com/ubuntu/ xenial-updates main restricted ## 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 ## universe WILL NOT receive any review or updates from the Ubuntu security ## team. deb http://cn.archive.ubuntu.com/ubuntu/ xenial universe # deb-src http://cn.archive.ubuntu.com/ubuntu/ xenial universe deb http://cn.archive.ubuntu.com/ubuntu/ xenial-updates universe # deb-src http://cn.archive.ubuntu.com/ubuntu/ xenial-updates universe
- 第二步，修改官方源為第三方源
sudo vim /etc/apt/sources.list 申請root權限修改該文件（sudo）
附贈網上多數人推薦的第三方源：
清華源ubuntu清華源
- 中科大源：
deb http://mirrors.ustc.edu.cn/ubuntu/ precise-updates main restricted deb-src http://mirrors.ustc.edu.cn/ubuntu/ precise-updates main restricted deb http://mirrors.ustc.edu.cn/ubuntu/ precise universe deb-src http://mirrors.ustc.edu.cn/ubuntu/ precise universe deb http://mirrors.ustc.edu.cn/ubuntu/ precise-updates universe deb-src http://mirrors.ustc.edu.cn/ubuntu/ precise-updates universe deb http://mirrors.ustc.edu.cn/ubuntu/ precise multiverse deb-src http://mirrors.ustc.edu.cn/ubuntu/ precise multiverse deb http://mirrors.ustc.edu.cn/ubuntu/ precise-updates multiverse deb-src http://mirrors.ustc.edu.cn/ubuntu/ precise-updates multiverse deb http://mirrors.ustc.edu.cn/ubuntu/ precise-backports main restricted universe multiverse deb-src http://mirrors.ustc.edu.cn/ubuntu/ precise-backports main restricted universe multiverse deb http://security.ubuntu.com/ubuntu precise-security main restricted deb-src http://security.ubuntu.com/ubuntu precise-security main restricted deb http://security.ubuntu.com/ubuntu precise-security universe deb-src http://security.ubuntu.com/ubuntu precise-security universe deb http://security.ubuntu.com/ubuntu precise-security multiverse deb-src http://security.ubuntu.com/ubuntu precise-security multiverse
- 搜狐源
deb http://mirrors.sohu.com/ubuntu/ precise-updates main restricted deb-src http://mirrors.sohu.com/ubuntu/ precise-updates main restricted deb http://mirrors.sohu.com/ubuntu/ precise universe deb-src http://mirrors.sohu.com/ubuntu/ precise universe deb http://mirrors.sohu.com/ubuntu/ precise-updates universe deb-src http://mirrors.sohu.com/ubuntu/ precise-updates universe deb http://mirrors.sohu.com/ubuntu/ precise multiverse deb-src http://mirrors.sohu.com/ubuntu/ precise multiverse deb http://mirrors.sohu.com/ubuntu/ precise-updates multiverse deb-src http://mirrors.sohu.com/ubuntu/ precise-updates multiverse deb http://mirrors.sohu.com/ubuntu/ precise-backports main restricted universe multiverse deb-src http://mirrors.sohu.com/ubuntu/ precise-backports main restricted universe multiverse
- 網易源
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
阿里雲
# deb cdrom:[Ubuntu 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420.1)]/ xenial main restricted deb-src http://archive.ubuntu.com/ubuntu xenial main restricted #Added by software-properties deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted deb-src http://mirrors.aliyun.com/ubuntu/ xenial main restricted multiverse universe #Added by software-properties deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted multiverse universe #Added by software-properties deb http://mirrors.aliyun.com/ubuntu/ xenial universe deb http://mirrors.aliyun.com/ubuntu/ xenial-updates universe deb http://mirrors.aliyun.com/ubuntu/ xenial multiverse deb http://mirrors.aliyun.com/ubuntu/ xenial-updates multiverse deb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse #Added by software-properties deb http://archive.canonical.com/ubuntu xenial partner deb-src http://archive.canonical.com/ubuntu xenial partner deb http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted multiverse universe #Added by software-properties deb http://mirrors.aliyun.com/ubuntu/ xenial-security universe deb http://mirrors.aliyun.com/ubuntu/ xenial-security multiverse
大家，有時候，需要把http改成https
然后，大家可以像我這樣，來做好備份，有時候，會因為網絡問題，需要用到不同的源，好切換！
/etc/apt/sources.list （比如，這是官方的源）
/etc/apt/sources.list.qinghua （比如，這是清華的源）
/etc/apt/sources.list.zhongkeda （比如，這是中科大的源）
/etc/apt/sources.list.sohu （比如，這是搜狐的源）
/etc/apt/sources.list.wangyi （比如，這是網易的源）
然后，需要用到哪個了，在比如，我需要用到清華源，則，
mv sources.list.qinghua sources.list
然后，把官方的源，暫時改為
mv sources.list sources.list.bak
擴展學習
現在沒有可用的軟件包 *** ，但是它被其它的軟件包引用了 和 E: 無法定位軟件包 ***問題解決（思路清晰干貨）
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