This file is indexed.

/etc/apt/apt.conf.d/01autoremove is in apt 0.8.16~exp12ubuntu10.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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APT
{
  NeverAutoRemove
  {
	"^firmware-linux.*";
	"^linux-firmware$";
	"^linux-image.*";
	"^kfreebsd-image.*";
	"^linux-restricted-modules.*";
	"^linux-ubuntu-modules-.*";
	"^gnumach$";
	"^gnumach-image.*";
  };

  Never-MarkAuto-Sections
  {
	"metapackages";
	"restricted/metapackages";
	"universe/metapackages";
	"multiverse/metapackages";
	"oldlibs";
	"restricted/oldlibs";
	"universe/oldlibs";
	"multiverse/oldlibs";
  };
};