Ubuntu

Binary package “login” in ubuntu focal

  1. Focal (20.04)
  2. login

system login tools

 This package provides some required infrastructure for logins and for
 changing effective user or group IDs, including:
  * login, the program that invokes a user shell on a virtual terminal;
  * nologin, a dummy shell for disabled user accounts;
  * su, a basic tool for executing commands as root or another user.

Source package