ubuntu14.10上apt-get install安装程序老是报找不到软件包，原来是要更改软件源，

sudo vim /etc/apt/sources.list

deb http://ftp.cuhk.edu.hk/pub/Linux/ubuntu trusty main restricted universe multiverse
deb /Linux/ubuntu trusty-security main restricted universe multiverse
deb /Linux/ubuntu trusty-updates main restricted universe multiverse
deb /Linux/ubuntu trusty-backports main restricted universe multiverse
deb /Linux/ubuntu trusty-proposed main restricted universe multiverse
deb-src /Linux/ubuntu trusty main restricted universe multiverse
deb-src /Linux/ubuntu trusty-security main restricted universe multiverse
deb-src /Linux/ubuntu trusty-updates main restricted universe multiverse
deb-src /Linux/ubuntu trusty-backports main restricted universe multiverse
deb-src /Linux/ubuntu trusty-proposed main restricted universe

sudo apt-update

完毕！（下载不成功就重试一下）
经本人测试，上面用的是香港中文大学的，用了163和aliyun的还是404.