原始链接：http://serverfault.com/questions/270260/how-do-you-use-apt-get-to-only-install-critical-security-updates-on-ubuntu

只安装安全更新

grep 'security' /etc/apt/sources.list > /tmp/security.sources.list

sudo apt-get upgrade -o Dir::Etc::SourceList=/tmp/security.sources.list