/lib/partman/undo.d/99signal_ubiquity 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 | #! /bin/sh -e
. /usr/share/debconf/confmodule
db_set ubiquity/partman-rebuild-cache ALL
exit 0
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