关于Unable to locate package net

关于Unable to locate package net

最近在学习大数据技术，在Linux中安装net-tools一直报错，通过查阅各种资料，做了一些总结并记录下来。

配置镜像仓库（换源）

       ubuntu的/etc/apt/source.list中的镜像源比较旧，需要更换一下（当然如果直接更新不报错就更好了），国内有很多Ubuntu的镜像源，包括阿里的、网易的，还有很多教育网的源，比如：清华源、中科大源。我们这里以清华源为例说一下如何修改Ubuntu 18.04里面默认的源。

1、输入命令修改sources.list文件，当然需要超级权限，所以要加sudo(如提示没权限,被占用,等等,直接重启系统)

sudo gedit /etc/apt/sources.list

2、编辑/etc/apt/sources.list文件,把文件中的内容替换成以下条目(操作前要备份),save,关闭：

deb / bionic main restricted universe multiverse
deb-src / bionic main restricted universe multiverse
deb / bionic-updates main restricted universe multiverse
deb-src / bionic-updates main restricted universe multiverse
deb / bionic-backports main restricted universe multiverse
deb-src / bionic-backports main restricted universe multiverse
deb / bionic-security main restricted universe multiverse
deb-src / bionic-security main restricted universe multiverse
deb / bionic-proposed main restricted universe multiverse
deb-src / bionic-proposed main restricted universe multiverse

顺便说一下，操作前要怎么样备份，执行下面的命令就可以进行备份了

sudo cp /etc/apt/sources.lst /etc/apt/sources.list_backup

该命令执行完后便会在sources.list的目录中出现一个sources.list_backup的备份文件。

3、修改完成后，保存文件，依次运行下面的命令

sudo apt-get update
sudo apt-get upgrade

至此完成国内源更新！（如果到此您便没有报错，那么恭喜你太幸运了，如果有小伙伴和我一样在这里踩坑了，不妨来看看我下一篇在换源过程中踩到的坑吧）

文末附加其他源内容，需要的自己添加进sources.list文件里面就ok了。

阿里源：

deb / bionic main restricted universe multiverse
deb / bionic-security main restricted universe multiverse
deb / bionic-updates main restricted universe multiverse
deb / bionic-proposed main restricted universe multiverse
deb / bionic-backports main restricted universe multiverse
deb-src / bionic main restricted universe multiverse
deb-src / bionic-security main restricted universe multiverse
deb-src / bionic-updates main restricted universe multiverse
deb-src / bionic-proposed main restricted universe multiverse
deb-src / bionic-backports main restricted universe multiverse

中科大源:

deb / bionic main restricted universe multiverse
deb-src / bionic main restricted universe multiverse
deb / bionic-updates main restricted universe multiverse
deb-src / bionic-updates main restricted universe multiverse
deb / bionic-backports main restricted universe multiverse
deb-src / bionic-backports main restricted universe multiverse
deb / bionic-security main restricted universe multiverse
deb-src / bionic-security main restricted universe multiverse
deb / bionic-proposed main restricted universe multiverse
deb-src / bionic-proposed main restricted universe multiverse

163源:

deb / bionic main restricted universe multiverse
deb / bionic-security main restricted universe multiverse
deb / bionic-updates main restricted universe multiverse
deb / bionic-proposed main restricted universe multiverse
deb / bionic-backports main restricted universe multiverse
deb-src / bionic main restricted universe multiverse
deb-src / bionic-security main restricted universe multiverse
deb-src / bionic-updates main restricted universe multiverse
deb-src / bionic-proposed main restricted universe multiverse
deb-src / bionic-backports main restricted universe multiverse