--- /dev/null
+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