deb http://co.archive.ubuntu.com/ubuntu/ bionic main restricted
deb http://co.archive.ubuntu.com/ubuntu/ bionic-updates main restricted
deb http://co.archive.ubuntu.com/ubuntu/ bionic universe
deb http://co.archive.ubuntu.com/ubuntu/ bionic-updates universe
deb http://co.archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu bionic-security main restricted
# deb-src http://security.ubuntu.com/ubuntu bionic-security main restricted
deb http://security.ubuntu.com/ubuntu bionic-security universe
# deb-src http://security.ubuntu.com/ubuntu bionic-security universe
deb http://security.ubuntu.com/ubuntu bionic-security multiverse
# deb-src http://security.ubuntu.com/ubuntu bionic-security multiverse