This file is indexed.

/var/lib/partconf/fstab.d/common is in ubiquity 2.18.7.

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

The actual contents of the file can be viewed below.

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$/dev/fd0	/floppy	auto	rw,user,noauto
$/dev/cdrom	/cdrom	auto	ro,user,noauto
proc /proc proc defaults