/lib/partman/automatically_partition/20some_device/choices 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 | #!/bin/sh
. /lib/partman/lib/base.sh
. /lib/partman/lib/auto-shared.sh
DEVS="$(get_auto_disks)"
[ "$DEVS" ] || exit 0
db_metaget partman-auto/text/use_device description
printf "regular\t$RET\n"
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