/lib/partman/undo.d/30parted 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 | #!/bin/sh
. /lib/partman/lib/base.sh
for dev in $DEVICES/*; do
cd $dev
open_dialog UNDO
close_dialog
done
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