since I updated Mosquitto v2.0.3 on Ubuntu 16.04 the users can’t connect to the broker. When I tried to run with /usr/sbin/mosquitto -c /etc/mosquitto/mosquitto.conf it threw the following message. 2020-12-22|12:37:02: Error: Unable to write pid file. I saw some people had the same problem, so I added pid_file /var/run/mosquitto/mosquitto.pid in mosquitto config but the problem did no go away. I