http://mirror.bizflycloud.vn/ubuntu/ http://mirror.viettelcloud.vn/ubuntu/ https://mirrors.nivacloud.net/ubuntu/ http://mirror.vietnix.vn/ubuntu/ https://mirrors.tino.org/ubuntu/ https://vn-mirrors.vhost.vn/ubuntu/ https://mirror.clearsky.vn/ubuntu/ http://mirrors.nhanhoa.com/ubuntu/ http://opensource.xtdv.net/ubuntu/ https://mirrors.bkns.vn/ubuntu/ http://archive.ubuntu.com/ubuntu/