Unable to boot KVM VPS in SolusVM: Failed to connect socket to '/var/run/libvirt/libvirt-sock'

Symptoms 

• Unable to boot the KVM VPS in SolusVM, upon pushing the Reboot(Debug) button at the page SolusVM > Virtual Server > VPS the following error occurs:
  

  SVM_ERROR: error: Failed to connect socket to '/var/run/libvirt/libvirt-sock': Connection refused

  Or
  

  SVM_ERROR: error: Failed to connect socket to '/var/run/libvirt/libvirt-sock': No such file or directory

• The libvirtd service status is the following on the KVM Slave Node:
  

  # systemctl status libvirtd
  ● libvirtd.service - Virtualization daemon
  Loaded: loaded (/usr/lib/systemd/system/libvirtd.service; enabled; vendor preset: enabled)
  Active: inactive (dead) since Fri 2021-10-22 11:29:19 EDT; 21min ago
  ...

Cause

The required service libvirtd is not running on the KVM Slave Node

Resolution

1. Log in to the Slave Node via SSH
2. Start the libvirtd service:
   

   # systemctl start libvirtd