cp /etc/apt/sources.list /etc/apt/sources.list.bak备份一下，
然后再来编辑：gedit /etc/apt/sources.list
最后再更新一下就行了：apt-get update
再加一个chromium的ppa源：
add-apt-repository ppa:chromium-daily/ppa
这样就可以安装chromium了
把里面的内容都删除了，改成下面的源，当然你还可以在网上查找一些更快的源换上去。
#网易
deb http://mirrors.163.com/ubuntu/ lucid main universe restricted multiverse
deb-src http://mirrors.163.com/ubuntu/ lucid main universe restricted multiverse
deb http://mirrors.163.com/ubuntu/ lucid-security universe main multiverse restricted
deb-src http://mirrors.163.com/ubuntu/ lucid-security universe main multiverse restricted
deb http://mirrors.163.com/ubuntu/ lucid-updates universe main multiverse restricted
deb http://mirrors.163.com/ubuntu/ lucid-proposed universe main multiverse restricted
deb-src http://mirrors.163.com/ubuntu/ lucid-proposed universe main multiverse restricted
deb http://mirrors.163.com/ubuntu/ lucid-backports universe main multiverse restricted
deb-src http://mirrors.163.com/ubuntu/ lucid-backports universe main multiverse restricted
deb-src http://mirrors.163.com/ubuntu/ lucid-updates universe main multiverse restricted
#官方的Ubuntu 10.10要保留几个用于紧急更新
deb http://security.Ubuntu.com/ubuntu maverick-security main restricted
deb-src http://security.Ubuntu.com/ubuntu maverick-security main restricted
deb http://security.Ubuntu.com/ubuntu maverick-security universe
deb-src http://security.Ubuntu.com/ubuntu maverick-security universe
deb http://security.Ubuntu.com/ubuntu maverick-security multiverse
deb-src http://security.Ubuntu.com/ubuntu maverick-security multiverse
