lsh-doc binary package in Ubuntu Bionic arm64

 lsh is a GPLed implementation of the Secure SHell protocol version 2
 (SSH2), a secure replacement for rlogin, rsh, and rcp.
 .
 This package contains the lsh documentation, including info
 pages and manpages about the various protocols which lsh uses,
 as well as various documents about lsh internals, protocols,
 and general lsh development.
 .
 In some countries it may be illegal to use any encryption
 at all without a special permit.

Source package