/usr/share/doc/elpa-aggressive-indent/c-example.gif is in elpa-aggressive-indent 1.5.2-1.
This file is owned by root:root, with mode 0o644.
However, this file being a binary blob, APT Browse does not store it.
Download the package archive to access the file: http://archive.ubuntu.com/ubuntu/pool/universe/a/aggressive-indent-mode/elpa-aggressive-indent_1.5.2-1_all.deb
.