/usr/share/diskimage-builder/elements/ubuntu/element-deps is in python-diskimage-builder 1.0.0-1.
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 | cache-url
cloud-init-datasources
dib-run-parts
dkms
dpkg
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