/var/lib/partconf/fstab.d/common is in ubiquity 2.10.16.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | $/dev/fd0 /floppy auto rw,user,noauto
$/dev/cdrom /cdrom auto ro,user,noauto
proc /proc proc defaults
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