Install libnutclient0 by entering the following commands in the terminal:
sudo apt update sudo apt install libnutclient0
network UPS tools - new client library
Network UPS Tools (NUT) is a client/server monitoring system that allows computers to share uninterruptible power supply (UPS) and power distribution unit (PDU) hardware. Clients access the hardware through the server, and are notified whenever the power status changes. . This package provides the new shared client library.