I have installed nagios-4.4.1 version on my Ubuntu 18.04 LTS. Everything look fine but I am only getting below mentioned error while starting my Nagios service can anyone help me on this how I can get rid of this problem.
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● nagios.service - Nagios Core 4.4.1
Loaded: loaded (/lib/systemd/system/nagios.service; disabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Thu 2018-11-29 14:06:12 UTC; 3s ago
Docs: https://www.nagios.org/documentation
Process: 19402 ExecStopPost=/bin/rm -f /usr/local/nagios/var/rw/nagios.cmd (code=exited, status=0/SUCCESS)
Process: 19391 ExecStart=/usr/local/nagios/bin/nagios -d /usr/local/nagios/etc/nagios.cfg (code=exited, status=0/SUCCESS)
Process: 19390 ExecStartPre=/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg (code=exited, status=0/SUCCESS)
Main PID: 19401 (code=exited, status=1/FAILURE)
Nov 29 14:06:12 Nginx-Backup nagios[19390]: Total Errors: 0
Nov 29 14:06:12 Nginx-Backup nagios[19390]: Things look okay - No serious problems were detected during the pre-flight check
Nov 29 14:06:12 Nginx-Backup systemd[1]: Started Nagios Core 4.4.1.
Nov 29 14:06:12 Nginx-Backup nagios[19401]: Nagios 4.3.4 starting... (PID=19401)
Nov 29 14:06:12 Nginx-Backup nagios[19401]: Local time is Thu Nov 29 14:06:12 UTC 2018
Nov 29 14:06:12 Nginx-Backup systemd[1]: nagios.service: Main process exited, code=exited, status=1/FAILURE
Nov 29 14:06:12 Nginx-Backup nagios[19401]: LOG VERSION: 2.0
Nov 29 14:06:12 Nginx-Backup systemd[1]: nagios.service: Failed with result 'exit-code'.
Nov 29 14:06:12 Nginx-Backup nagios[19401]: [u]qh: Failed to init socket '/usr/local/nagios/var/rw/nagios.qh'. unlink() failed: Permission denied[/u]
Nov 29 14:06:12 Nginx-Backup nagios[19401]: Error: Failed to initialize query handler. Aborting