lcrack binary package in Ubuntu Bionic amd64

 Lepton's Crack is a generic password cracker, easily customizable with
 a simple plug-in system. It can perform a dictionary-based (wordlist)
 attack, as well as a brute-force (incremental) password scan.
 .
 For the incremental scan, the user can provide a regex-like expression
 that will be enumerated, thus checking every possible combination. This
 powerful feature effectively combines `shoulder-surfing' with standard
 brute-forcing.
 .
 By default it comes with the following modules:
        * md4 : standard MD4 hash
        * md5 : standard MD5 hash
        * nt4 : NT MD4/Unicode
        * dom : Lotus Domino HTTP password
        * sha1 : standard SHA-1 hash
        * null : trivial 1-byte hash

Source package