Siwei Zhang wrote:
root@web3-eqix-sjo:/var/cache/apt/archives# more /etc/debian_version 3.1
You are using sarge, but your apt repository is pointing to current stable "etch", which makes your apt unusable. You should follow sarge->etch upgrade guide first by refering to etch release note:
http://www.debian.org/releases/etch/i386/release-notes/ch-upgrading.en.html