安装ubuntu 18.04后，使用国外源太慢了，修改为国内源会快很多。

修改阿里源为ubuntu 18.04默认的源

备份/etc/apt/sources.list

备份

cp /etc/apt/sources.list /etc/apt/sources.list.bak

在/etc/apt/sources.list文件前面添加如下条目

添加阿里源

deb htt常识题p://mirrors.aliyun.com/ubuntu/ bionic main restricted univer multiverdeb /d/file/titlepic/ bionic-curity main restricted univer multiverdeb /d/file/titlepic/ bionic-updates main restricted univer multiverdeb /d/file/titlepic/ bionic-propod main restricted univer multiverdeb /d/file/titlepic/ bionic-backports main restricted univer multiverdeb-src /d/file/titlepic/ bionic main restricted univer multiverdeb-src /d/file/titlepic/ bionic-curity main restricted univer multiverdeb-src /d/file/titlepic/ bionic-updates main restricted univer multiverdeb-src /d/file/titlepic/ bionic-propod main restricted univer multiverdeb-src /d/file/titlepic/ bionic-backports main restricted univer multiver

最后执行如下命令更新源

更新

sudo apt-get updatesudo apt-get upgrade

另外其他几个国内源如下：
中科大源

中科大源

deb /d/file/titlepic/ bionic main restricted univer multiverdeb-src /d/file/titlepic/ bionic main restricted univer multiverdeb /d/file/titlepic/ bionic-updates main restricted univer multiverdeb-src /d/file/titlepic/ bionic-updates main restricted univer multiverdeb /d/file/titlepic/ bionic-backports main restricted univer multwasting all the tearsiverdeb-src /d/file/titlepic/ bionic-backports main restricted univer multiverdeb /d/file/titlepic/ bionic-curit引力y main restricted univer multiverdeb-src /d/file/titlepic/ bionic-curity main restricted univer multiverdeb /d/file/titlepic/ bionic-propod main restricted univer multiverdeb-src htt南下徐海俏ps://mirrors.ustc.edu.cn/ubuntu/ bionic-propod main restricted univer multiver

163源

163源

deb /d/file/titlepic/ bionic main restricted univer multiverdeb /d/file/titlepic/ bionic-curity main restricted univer multiverdeb /d/file/titlepic/ bionic-updates main restricted univer multiverdeb /d/file/titlepic/ bionic-propod main restricted univer multiverdeb /d/file/titlepic/ bionic-backports main restricted univer multiverdeb-src /d/file/titlepic/ bionic main restricted univer multiverdeb-src /d/file/titlepic/ bionic-curity main restricted univer multiverdeb-src /d/file/titlepic/ bionic-updates main restricted univer multiverdeb-src /d/file/titlepic/ bionic-propod main restricted univer multiverdeb-src /d/file/titlepic/ bionic-backports main restricted univer multiver

清华源

清华源

deb /d/file/titlepic/ bionic main restricted univer multiverdeb-src /d/file/titlepic/ bionic main restricted univer multiverdeb /d/file/titlepic/ bionic-updates main restricted univer multiverdeb-src /d/file/titlepic/ bionic-updates main restricted univer multiverdeb /d/file/titlepic/ bionic-backports main restricted univer multiverdeb-src /d/file/titlepic/ bionic-backports main restricted univer multiverdeb /d/file/titlepic/ bionic-curity main restricted univer multiverdeb-src /d/file/titlepic/ bionic-curity main restricted univer multiverdeb /d/file/titlepic/ bionic-propod main restric合租房合同ted univer multiverdeb-src /d/file/titlepic/ bionic-propod main restricted univer multiver