deb http://us.archive.ubuntu.com/ubuntu/ bionic main
deb http://us.archive.ubuntu.com/ubuntu/ bionic-updates main
deb http://us.archive.ubuntu.com/ubuntu/ bionic-security main
deb-src http://us.archive.ubuntu.com/ubuntu/ bionic main
deb-src http://us.archive.ubuntu.com/ubuntu/ bionic-updates main
deb-src http://us.archive.ubuntu.com/ubuntu/ bionic-security main