1、打开源列表文件， 把里面的地址全删除
sudo gedit /etc/apt/sources.list
2、换上如下的地址
deb lucid main restricted universe multiverse
deb lucid-security main restricted universe multiverse
deb lucid-updates main restricted universe multiverse
deb lucid-proposed main restricted universe multiverse
deb lucid-backports main restricted universe multiverse
deb-src lucid main restricted universe multiverse
deb-src lucid-security main restricted universe multiverse
deb-src lucid-updates main restricted universe multiverse
deb-src lucid-proposed main restricted universe multiverse
deb-src lucid-backports main restricted universe multiverse
3、更新源
sudo apt-get update
转载：
https://blog.csdn.net/suquan629/article/details/52333769
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