配置Ubuntu server 12.04源
今天安装了ubuntu server12.04，但是系统默认的源比较慢，所以更改了一下源地址。方法如下：[*]首先是备份之前源配置文件
cp /etc/apt/sources.list /etc/apt/sources.list.bak
[*]修改源配置文件，需要有root权限的用户
sudo vim /etc/apt/sources.list
[*]我选择了搜狐源，还算是比较快的了，在打开的文件的末尾加入一下其中一个源： 搜狐源：
deb http://mirrors.sohu.com/Ubuntu/ precise-updates main restricted
deb-src http://mirrors.sohu.com/Ubuntu/ precise-updates main restricted
deb http://mirrors.sohu.com/Ubuntu/ precise universe
deb-src http://mirrors.sohu.com/Ubuntu/ precise universe
deb http://mirrors.sohu.com/Ubuntu/ precise-updates universe
deb-src http://mirrors.sohu.com/Ubuntu/ precise-updates universe
deb http://mirrors.sohu.com/Ubuntu/ precise multiverse
deb-src http://mirrors.sohu.com/Ubuntu/ precise multiverse
deb http://mirrors.sohu.com/Ubuntu/ precise-updates multiverse
deb-src http://mirrors.sohu.com/Ubuntu/ precise-updates multiverse
deb http://mirrors.sohu.com/Ubuntu/ precise-backports main restricted universe multiverse
deb-src http://mirrors.sohu.com/Ubuntu/ precise-backports main restricted universe multiverse
网易源：
deb http://mirrors.163.com/Ubuntu/ precise-updates main restricted
deb-src http://mirrors.163.com/Ubuntu/ precise-updates main restricted
deb http://mirrors.163.com/Ubuntu/ precise universe
deb-src http://mirrors.163.com/Ubuntu/ precise universe
deb http://mirrors.163.com/Ubuntu/ precise-updates universe
deb-src http://mirrors.163.com/Ubuntu/ precise-updates universe
deb http://mirrors.163.com/Ubuntu/ precise multiverse
deb-src http://mirrors.163.com/Ubuntu/ precise multiverse
deb http://mirrors.163.com/Ubuntu/ precise-updates multiverse
deb-src http://mirrors.163.com/Ubuntu/ precise-updates multiverse
deb http://mirrors.163.com/Ubuntu/ precise-backports main restricted universe multiverse
deb-src http://mirrors.163.com/Ubuntu/ precise-backports main restricted universe multiverse
[*]更新
sudo apt-get update
sudo apt-get upgrade
[*]这样就配置好了
在执行sudo apt-get update的时候，可能会出现一下问题：
W: GPG error: http://extras.ubuntu.com quantal Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 16126D3A3E5C1192
解决办法：
gpg --keyserver hkp://subkeys.pgp.net --recv-keys 16126D3A3E5C1192
gpg --export --armor 16126D3A3E5C1192 | sudo apt-key add -
再试着去更新
apt-get update && apt-get dist-upgrade
在处理一件事情的时候，遇到问题并不可怕，关键是怎么解决问题，不管怎样，能解决问题，也算是一种收获
参考资料：http://www.redmine.org/projects/redmine/wiki/HowTo_Install_Redmine_in_Ubuntu
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