在Ubuntu版本中如何更改下载源
1.查看系统版本号（官⽅语⾔系统代码）
lsb_release -c
得到本系统的系统代码
类似其他版本的
Ubuntu 12.04 (LTS)代号为precise。
Ubuntu 14.04 (LTS)代号为trusty。
Ubuntu 15.04 代号为vivid。
Ubuntu 15.10 代号为wily。
Ubuntu 16.04 (LTS)代号为xenial
这是⼀个阿⾥的是我的系统就应该要将上⾯的trusty改为bionic
2.⾸先到配置⽂件，将系统配置⽂件备份
sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup
3.打开⽂件
使⽤vim和geidt都⾏
  vi /etc/apt/sources.list
  sudo gedit /etc/apt/sources.list
⼆者选其⼀
4.注释或者删除⾥⾯的⽂件内容（我⾃⼰选择的是删除⽐较快）然后将下⾯的这些复制进去保存⼀般我们选择下⾯的阿⾥源：
deb mirrors.aliyun/ubuntu/ bionic main restricted universe multiverse
deb-src mirrors.aliyun/ubuntu/ bionic main restricted universe multiverse
deb mirrors.aliyun/ubuntu/ bionic-security main restricted universe multiverse
deb-src mirrors.aliyun/ubuntu/ bionic-security main restricted universe multiverse
deb mirrors.aliyun/ubuntu/ bionic-updates main restricted universe multiverse
deb-src mirrors.aliyun/ubuntu/ bionic-updates main restricted universe multiverse
deb mirrors.aliyun/ubuntu/ bionic-backports main restricted universe multiverse
deb-src mirrors.aliyun/ubuntu/ bionic-backports main restricted universe multiverse
deb mirrors.aliyun/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src mirrors.aliyun/ubuntu/ bionic-proposed main restricted universe multiverse
　下⾯还有其他官⽅源⾃⾏试验
官⽅源：
deb archive.ubuntu/ubuntu/ trusty main restricted universe multiverse
ubuntu vim命令deb archive.ubuntu/ubuntu/ trusty-security main restricted universe multiverse
deb archive.ubuntu/ubuntu/ trusty-updates main restricted universe multiverse
deb-src archive.ubuntu/ubuntu/ trusty-security main restricted universe multiverse deb-src archive.ubuntu/ubuntu/ trusty-updates main restricted universe multiverse deb-src archive.ubuntu/ubuntu/ trusty-proposed main restricted universe multiverse deb-src archive.ubuntu/ubuntu/ trusty-backports main restricted universe multiverse deb mirrors.163/ubuntu/ trusty main restricted universe multiverse
163源：
deb mirrors.163/ubuntu/ trusty-security main restricted universe multiverse
deb mirrors.163/ubuntu/ trusty-updates main restricted universe multiverse
deb mirrors.163/ubuntu/ trusty-proposed main restricted universe multiverse
deb mirrors.163/ubuntu/ trusty-backports main restricted universe multiverse
deb-src mirrors.163/ubuntu/ trusty main restricted universe multiverse
deb-src mirrors.163/ubuntu/ trusty-security main restricted universe multiverse deb-src mirrors.163/ubuntu/ trusty-updates main restricted universe multiverse deb-src mirrors.163/ubuntu/ trusty-proposed main restricted universe multiverse deb-src mirrors.163/ubuntu/ trusty-backports main restricted universe multiverse
阿⾥源：
deb mirrors.aliyun/ubuntu/ trusty main restricted universe multiverse
deb mirrors.aliyun/ubuntu/ trusty-security main restricted universe multiverse
deb mirrors.aliyun/ubuntu/ trusty-updates main restricted universe multiverse
deb mirrors.aliyun/ubuntu/ trusty-proposed main restricted universe multiverse
deb mirrors.aliyun/ubuntu/ trusty-backports main restricted universe multiverse deb-src mirrors.aliyun/ubuntu/ trusty main restricted universe multiverse
deb-src mirrors.aliyun/ubuntu/ trusty-security main restricted universe multiverse deb-src mirrors.aliyun/ubuntu/ trusty-updates main restricted universe multiverse deb-src mirro
rs.aliyun/ubuntu/ trusty-proposed main restricted universe multiverse deb-src mirrors.aliyun/ubuntu/ trusty-backports main restricted universe multiverse centos源（放⼼使⽤）：
deb centos.bitcomm/ubuntu trusty main restricted universe multiverse
deb centos.bitcomm/ubuntu trusty-security main restricted universe multiverse
deb centos.bitcomm/ubuntu trusty-updates main restricted universe multiverse
deb centos.bitcomm/ubuntu trusty-backports main restricted universe multiverse deb centos.bitcomm/ubuntu trusty-proposed main restricted universe multiverse
deb-src centos.bitcomm/ubuntu trusty main restricted universe multiverse
deb-src centos.bitcomm/ubuntu trusty-security main restricted universe multiverse deb-src centos.bitcomm/ubuntu trusty-updates main restricted universe multiverse deb-src centos.bitcomm/ubuntu trusty-backports main restricted universe multiverse deb-src centos.bitcomm/ubuntu trusty-proposed main restricted universe multiverse 搜狐源：
deb mirrors.sohu/ubuntu/ trusty main restricted universe multiverse
deb mirrors.sohu/ubuntu/ trusty-backports main restricted universe multiverse deb-src mirrors.sohu/ubuntu/ trusty main restricted universe multiverse
deb-src mirrors.sohu/ubuntu/ trusty-security main restricted universe multiverse deb-src mirrors.sohu/ubuntu/ trusty-updates main restricted universe multiverse deb-src mirrors.sohu/ubuntu/ trusty-proposed main restricted universe multiverse deb-src mirrors.sohu/ubuntu/ trusty-backports main restricted universe multiverse  　
4.保存退出
如果⽤gedit打开就直接点击上⾯的保存
如果⽤vim打开就⽤ ESC ：wq
5.更新源
sudo apt-get update
6.更新软件
sudo apt-get dist-upgrade
sudo apte-get upgrade

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