Ubuntu14.04 LTS更新源

1、首先备份源列表
sudo cp /etc/apt/sources.list /etc/apt/sources.list_backup

2、编辑
vi /etc/apt/sources.list

将内容更换为
deb http://archive.ubuntu.com/ubuntu/ trusty main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ trusty-security main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ trusty-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ trusty-proposed main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ trusty main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ trusty-security main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ trusty-updates main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ trusty-proposed main restricted universe multiverse
deb http://cran.rstudio.com/bin/linux/ubuntu trusty/
deb-src http://archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse

3、刷新列表

sudo apt-get update

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