关于Ubuntu出现无法定位软件包的问题解决

第一种方法：

在 /etc/apt sources.list 添加镜像源 deb http://archive.ubuntu.com/ubuntu/trusty main
universe restricted multiverse 

sudo apt-get update ~~~

第二种方法：

1.在修改source.list前，最好先备份一份

执行备份命令
sudo cp /etc/apt/sources.list /etc/apt/sources.list.old
 

2.执行命令打开source.list文件：

 

sudo vim /etc/apt/source.list

 

 

3.复制源(源可能过期，过期去网上查找新的源复制）

把下面的复制到source.list中去，并覆盖原来的文件内容。
deb-src http://mirror.neu.edu.cn/ubuntu/ xenial main restricted #Added by
software-properties deb http://mirror.neu.edu.cn/ubuntu/ xenial main restricted
deb-src http://mirror.neu.edu.cn/ubuntu/ xenial restricted multiverse universe
#Added by software-properties deb http://mirror.neu.edu.cn/ubuntu/
xenial-updates main restricted deb-src http://mirror.neu.edu.cn/ubuntu/
xenial-updates main restricted multiverse universe #Added by
software-properties deb http://mirror.neu.edu.cn/ubuntu/ xenial universe deb
http://mirror.neu.edu.cn/ubuntu/ xenial-updates universe deb
http://mirror.neu.edu.cn/ubuntu/ xenial multiverse deb
http://mirror.neu.edu.cn/ubuntu/ xenial-updates multiverse deb
http://mirror.neu.edu.cn/ubuntu/ xenial-backports main restricted universe
multiverse deb-src http://mirror.neu.edu.cn/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://mirror.neu.edu.cn/ubuntu/ xenial-security main restricted deb-src
http://mirror.neu.edu.cn/ubuntu/ xenial-security main restricted multiverse
universe #Added by software-properties deb http://mirror.neu.edu.cn/ubuntu/
xenial-security universe deb http://mirror.neu.edu.cn/ubuntu/ xenial-security
multiverse
 
清华大学 # deb cdrom:[Ubuntu 16.04 LTS _Xenial Xerus_ - Release amd64
(20160420.1)]/ xenial main restricted deb
http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial main restricted deb
http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates main restricted deb
http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial universe deb
http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates universe deb
http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial multiverse deb
http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates multiverse deb
http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-backports main restricted
universe multiverse deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/
xenial-security main restricted deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/
xenial-security universe deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/
xenial-security multiverse
4update命令
sudo apt-get update
 

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