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