1. backup old source listsudo CP/etc/APT/source. LIST/etc/APT/sourc. list_bk 2. modify source listsudo gedit/etc/APT/source. listchoose a fast server according to your location
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- Deb http://centos.bitcomm.cn/ubuntu natty main restricted universe multiverse
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- Deb http://centos.bitcomm.cn/ubuntu natty-security main restricted universe multiverse
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- Deb http://centos.bitcomm.cn/ubuntu natty-Updates main restricted universe multiverse
- Deb http://centos.bitcomm.cn/ubuntu natty-backports main restricted universe multiverse
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- Deb http://centos.bitcomm.cn/ubuntu natty-proposed main restricted universe multiverse
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- The Deb-Src http://centos.bitcomm.cn/ubuntu natty main restricted universe multiverse
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- Deb-Src http://centos.bitcomm.cn/ubuntu natty-security main restricted universe multiverse
- Deb-Src http://centos.bitcomm.cn/ubuntu natty-Updates main restricted universe multiverse
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- Deb-Src http://centos.bitcomm.cn/ubuntu nat-backports main restricted universe multiverse
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- Deb-Src http://centos.bitcomm.cn/ubuntu nat-proposed main restricted universe multiverse
3. Update New Source listsudo apt-Get update come from http://blog.chinaunix.net/uid-452173-id-3253206.html