Binary package “kshutdown” in ubuntu bionic

advanced shut down utility for KDE

 It has 4 main commands:
  - Shut Down (logout and halt the system),
  - Reboot (logout and reboot the system),
  - Lock Screen (lock the screen using a screen saver),
  - Logout (end the session and logout the user).
 It features time and delay options, command line support, wizard,
 and sounds.