You need to be logged on as the root user to issue the ksysguard command.

Question

Quizplus · Accepted Answer

The ksysguard command can be issued by any user; it does not specifically require root privileges to run. KSysGuard, also known as KDE System Guard, is a system monitor tool designed for KDE desktop environments, and it allows users to monitor system processes and performance. Access to certain administrative or sensitive operations within KSysGuard might require elevated privileges, but launching the application itself does not necessitate being logged in as the root user.

You Need to Be Logged on as the Root User