Types: deb deb-src
URIs: http://mirror.mcs.anl.gov/ubuntu
Suites: {from_dist} {from_dist}-updates
Components: main restricted universe multiverse
Enabled: no

Types: deb
URIs: http://security.ubuntu.com/ubuntu
Suites: {to_dist}-security
Components: main restricted universe multiverse
Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg

Types: deb
URIs: {default_source_uri}
Suites: {to_dist} {to_dist}-updates
Components: main restricted universe multiverse
Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg
