/lib/partman/finish.d/39create_fstab_header is in ubiquity 18.04.14.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | #!/bin/sh
mkdir -p /target/etc
case `udpkg --print-os` in
linux)
cat >/target/etc/fstab <<EOF
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
EOF
printf "%-15s %-15s %-7s %-15s %-7s %s\n" '# <file system>' '<mount point>' '<type>' '<options>' '<dump>' '<pass>' >> /target/etc/fstab
;;
kfreebsd)
cat >/target/etc/fstab <<EOF
# /etc/fstab: static file system information.
#
EOF
printf "%-15s %-15s %-7s %-15s %-7s %s\n" '# <file system>' '<mount point>' '<type>' '<options>' '<dump>' '<pass>' >> /target/etc/fstab
printf "%-15s %-15s %-7s %-15s %-7s %s\n" proc /proc linprocfs rw 0 0 >> /target/etc/fstab
printf "%-15s %-15s %-7s %-15s %-7s %s\n" sys /sys linsysfs rw 0 0 >> /target/etc/fstab
printf "%-15s %-15s %-7s %-15s %-7s %s\n" fdesc /dev/fd fdescfs rw 0 0 >> /target/etc/fstab
;;
hurd)
cat >/target/etc/fstab <<EOF
# /etc/fstab: static file system information.
#
EOF
printf "%-15s %-15s %-7s %-15s %-7s %s\n" '# <file system>' '<mount point>' '<type>' '<options>' '<dump>' '<pass>' >> /target/etc/fstab
;;
esac
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