How to fix the problem

how to fix the problem after i check /etc/init.d/asterisk status .
rc_read_config can’t open /etc/radiusclient-ng/radiusclient.conf no such file or directory

radiusclient.conf doesnt exist so assuming you want to use RADIUS as CDR Backend make sure the Radiusclient library has been installed correctly

(Home - Asterisk Documentation)

It is critical?

I have same issue.

vmware 15.5

ubuntu 20.4

Nope. How did you get/build Asterisk? Then, I explain why you get that error and how to disable it.

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This is a zombie thread from 2 years ago.