網(wǎng)上應(yīng)該可以找到很多關(guān)于ubuntu源的設(shè)置方法，但是如果不搞清楚就隨便設(shè)置的話，不僅不能起到應(yīng)有的效果，還會(huì)由于一些問(wèn)題導(dǎo)致apt不可用。
最正確的更換源的方法應(yīng)該如系統(tǒng)提示的：
## a.) add ‘apt_preserve_sources_list: true‘ to /etc/cloud/cloud.cfg
## or do the same in user-data
## b.) add sources in /etc/apt/sources.list.d
## c.) make changes to template file /etc/cloud/templates/sources.list.tmpl
這種方法有點(diǎn)沒(méi)弄明白在/etc/apt/sources.list.d應(yīng)該添加的是什么內(nèi)容，如果是源文件的話，最后更改的模板又是什么作用？也沒(méi)有去嘗試，有時(shí)間會(huì)解決一下。
以下提供設(shè)置阿里源的方法，其他源也可以如法炮制：
1. 首先查看自己的ubuntu系統(tǒng)的codename，這一步很重要，直接導(dǎo)致你更新的源是否對(duì)你的系統(tǒng)起效果，查看方法：
lsb_release -a
如，我的系統(tǒng)顯示：
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.2 LTS
Release: 14.04
Codename: trusty
顯示了一些ubuntu的版本信息，需要得到的是Codename，比如，我這里是trusty
2. 確認(rèn)阿里源支持：
登陸以下網(wǎng)頁(yè)：http://mirrors.aliyun.com/ubuntu/dists/
該網(wǎng)頁(yè)顯示了阿里云支持的ubuntu系統(tǒng)下各個(gè)Codename版本，確保自己的Codename在該網(wǎng)頁(yè)中存在（一般都會(huì)有的）
2. 備份系統(tǒng)源：
cd /etc/apt
sudo mv sources.list sources.list_bak
3. 添加新的源文件：
sudo vi sources.list
并添加以下內(nèi)容：注意，每一行的trusty應(yīng)該用第一步查看得到的Codename來(lái)代替
deb http://mirrors.aliyun.com/ubuntu/ trusty main multiverse restricted universe
deb http://mirrors.aliyun.com/ubuntu/ trusty-backports main multiverse restricted universe
deb http://mirrors.aliyun.com/ubuntu/ trusty-proposed main multiverse restricted universe
deb http://mirrors.aliyun.com/ubuntu/ trusty-security main multiverse restricted universe
deb http://mirrors.aliyun.com/ubuntu/ trusty-updates main multiverse restricted universe
deb-src http://mirrors.aliyun.com/ubuntu/ trusty main multiverse restricted universe
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-backports main multiverse restricted universe
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-proposed main multiverse restricted universe
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-security main multiverse restricted universe
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-updates main multiverse restricted universe
4. 保存并且sudo apt-get update，更新成功
5. 以下提供配置腳本：
1 Codename=$( (lsb_release -a)|awk ‘{print $2}‘|tail -n 1 )
2 echo "\
3 deb http://mirrors.aliyun.com/ubuntu/ $Codename main multiverse restricted universe
4 deb http://mirrors.aliyun.com/ubuntu/ $Codename-backports main multiverse restricted universe
5 deb http://mirrors.aliyun.com/ubuntu/ $Codename-proposed main multiverse restricted universe
6 deb http://mirrors.aliyun.com/ubuntu/ $Codename-security main multiverse restricted universe
7 deb http://mirrors.aliyun.com/ubuntu/ $Codename-updates main multiverse restricted universe
8 deb-src http://mirrors.aliyun.com/ubuntu/ $Codename main multiverse restricted universe
9 deb-src http://mirrors.aliyun.com/ubuntu/ $Codename-backports main multiverse restricted universe
10 deb-src http://mirrors.aliyun.com/ubuntu/ $Codename-proposed main multiverse restricted universe
11 deb-src http://mirrors.aliyun.com/ubuntu/ $Codename-security main multiverse restricted universe
12 deb-src http://mirrors.aliyun.com/ubuntu/ $Codename-updates main multiverse restricted universe ">sources.list
13 apt-get update
sudo運(yùn)行該腳本即可（注意運(yùn)行之前最好備份之前的sources.list）
