apt源 （vi /etc/apt/sources.list）
# cn99源(mirrors.163.com)

deb http://Ubuntu.cn99.com/ubuntu/ karmic main restricted universe multiverse

deb http://Ubuntu.cn99.com/ubuntu/ karmic-backports restricted universe multiverse

deb http://Ubuntu.cn99.com/ubuntu/ karmic-proposed main restricted universe multiverse

deb http://Ubuntu.cn99.com/ubuntu/ karmic-security main restricted universe multiverse

deb http://Ubuntu.cn99.com/ubuntu/ karmic-updates main restricted universe multiverse

deb-src http://Ubuntu.cn99.com/ubuntu/ karmic main restricted universe multiverse

deb-src http://Ubuntu.cn99.com/ubuntu/ karmic-backports main restricted universe multiverse

deb-src http://Ubuntu.cn99.com/ubuntu/ karmic-proposed main restricted universe multiverse

deb-src http://Ubuntu.cn99.com/ubuntu/ karmic-security main restricted universe multiverse

deb-src http://Ubuntu.cn99.com/ubuntu/ karmic-updates main restricted universe multiverse