由于一直用着老版本的Ubuntu 10.04，最近在更新/安装软件时，很是不顺，因为ubuntu安装源已经很多都失效了，这里特别记录一下目前可用的官方安装源；
deb http://old-releases.ubuntu.com/ubuntu/ karmic main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ karmic-security main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ karmic-updates main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ karmic-proposed main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ karmic-backports main restricted universe multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ karmic main restricted universe multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ karmic-security main restricted universe multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ karmic-updates main restricted universe multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ karmic-proposed main restricted universe multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ karmic-backports main restricted universe multiverse
修改Ubuntu安装源方法：
sudo gedit /etc/apt/sources.list
替换即可
转自 http://www.linuxidc.com/Linux/2016-01/128029.htm
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来源：zxwangyun
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