Install sysvinit-utils by entering the following commands in the terminal:
sudo apt update sudo apt install sysvinit-utils
Description:
System-V-like utilities
This package contains the important System-V-like utilities. . Specifically, this package includes: killall5, pidof
Homepage: http://savannah.nongnu.org/projects/sysvinit
Version: 2.88dsf-59.10ubuntu1
Section: admin