/lib/partman/ciphers/dm-crypt/ is in ubiquity 2.18.7.
This file is owned by root:root, with mode 0o755.
..
/lib/partman/ciphers/dm-crypt/aes/
/lib/partman/ciphers/dm-crypt/aes/desc
/lib/partman/ciphers/dm-crypt/aes/keysize
/lib/partman/ciphers/dm-crypt/aes/module
/lib/partman/ciphers/dm-crypt/blowfish/
/lib/partman/ciphers/dm-crypt/blowfish/desc
/lib/partman/ciphers/dm-crypt/blowfish/keysize
/lib/partman/ciphers/dm-crypt/blowfish/module
/lib/partman/ciphers/dm-crypt/ivalgorithm
/lib/partman/ciphers/dm-crypt/keyhash.disabled
/lib/partman/ciphers/dm-crypt/keytype
/lib/partman/ciphers/dm-crypt/serpent/
/lib/partman/ciphers/dm-crypt/serpent/desc
/lib/partman/ciphers/dm-crypt/serpent/keysize
/lib/partman/ciphers/dm-crypt/serpent/module
/lib/partman/ciphers/dm-crypt/twofish/
/lib/partman/ciphers/dm-crypt/twofish/desc
/lib/partman/ciphers/dm-crypt/twofish/keysize
/lib/partman/ciphers/dm-crypt/twofish/module