/usr/share/doc/cloud-init/examples/cloud-config-update-apt.txt is in cloud-init 18.2-14-g6d48d265-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | #cloud-config
# Update apt database on first boot (run 'apt-get update').
# Note, if packages are given, or package_upgrade is true, then
# update will be done independent of this setting.
#
# Default: false
# Aliases: apt_update
package_update: false
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