cat /etc/apt/sources.list

deb http://apt.sibnet.ru:9999/ubuntu lucid main restricted multiverse  universe
deb-src http://apt.sibnet.ru:9999/ubuntu lucid main restricted multiverse  universe

deb http://apt.sibnet.ru:9999/ubuntu lucid-updates main restricted
deb-src http://apt.sibnet.ru:9999/ubuntu lucid-updates main restricted

deb http://apt.sibnet.ru:9999/ubuntu-security lucid-security main restricted
deb-src http://apt.sibnet.ru:9999/ubuntu-security lucid-security main restricted
deb http://apt.sibnet.ru:9999/ubuntu-security lucid-security universe
deb-src http://apt.sibnet.ru:9999/ubuntu-security lucid-security universe
deb http://apt.sibnet.ru:9999/ubuntu-security lucid-security multiverse
deb-src http://apt.sibnet.ru:9999/ubuntu-security lucid-security multiverse