i cannot update my ubuntu from terminal or software centre and the links work if i go to them manually. heres the terinal feed..i have to remove the links but they work... ........ Err security.ubuntu.com precise-security/main amd64 Packages Unable to connect to 172.25.10.3:80: ......... ....... ........ ....... W: Failed to fetch archive.linux.duke.edu/ubuntu/dists/precise/universe/binary-amd64/Packages Unable to connect to 172.25.10.3:80: