/lib/partman/active_partition/46keysize/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 11 12 13 14 15 16 17 18 19 | #!/bin/sh
. /lib/partman/lib/crypto-base.sh
dev=$1
id=$2
part=$dev/$id
[ -f $part/method ] || exit 0
[ -f $part/crypto_type ] || exit 0
[ -f $part/cipher ] || exit 0
method=$(cat $part/method)
type=$(cat $part/crypto_type)
cipher=$(cat $part/cipher)
if [ $method = crypto ]; then
crypto_dochoice $part $type $cipher keysize
fi
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