/lib/partman/finish.d/70aptinstall_ext3 is in ubiquity 2.18.7.
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 | #!/bin/sh
. /lib/partman/lib/base.sh
ext3=no
for dev in $DEVICES/*; do
[ -d "$dev" ] || continue
cd $dev
partitions=
open_dialog PARTITIONS
while { read_line num id size type fs path name; [ "$id" ]; }; do
[ "$fs" != free ] || continue
[ -f $id/method -a -f $id/acting_filesystem ] || continue
filesystem=$(cat $id/acting_filesystem)
case $filesystem in
ext3|ext4)
ext3=yes
;;
esac
done
close_dialog
done
if [ "$ext3" = yes ]; then
apt-install e2fsprogs || true
fi
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