● libvirtd.service ,Active: inactive (dead), Initialization of QEMU state driver failed: invalid argument: Failed to parse user 'libvirt-qemu' - gpu

Question

When I check status of libvirtd using the cmd: sudo systemctl status libvirtd the o/p is as follows:
● libvirtd.service - Virtualization daemon
Loaded: loaded (/lib/systemd/system/libvirtd.service; enabled; vendor preset: enabled)
Active: inactive (dead) since Thu 2021-07-22 18:00:59 EDT; 1min 4s ago
TriggeredBy: ● libvirtd-admin.socket
● libvirtd.socket
● libvirtd-ro.socket
Docs: man:libvirtd(8)
https://libvirt.org
Process: 1717 ExecStart=/usr/sbin/libvirtd $libvirtd_opts (code=exited, status=0/SUCCESS)
Main PID: 1717 (code=exited, status=0/SUCCESS)
Jul 22 18:00:59 eb2-2259-lin04 systemd[1]: Starting Virtualization daemon...
Jul 22 18:00:59 eb2-2259-lin04 systemd[1]: Started Virtualization daemon.
Jul 22 18:00:59 eb2-2259-lin04 libvirtd[1717]: libvirt version: 6.0.0, package: 0ubuntu8.11 (Christian Ehrhardt <christian.ehrhardt#canonical.com> Tue, 05 Jan 2021 13:48:48 +0100)
Jul 22 18:00:59 libvirtd[1717]: hostname: eb2-2259-lin04
Jul 22 18:00:59 eb2-2259-lin04 libvirtd[1717]: invalid argument: Failed to parse user 'libvirt-qemu'
Jul 22 18:00:59 eb2-2259-lin04 libvirtd[1717]: Initialization of QEMU state driver failed: invalid argument: Failed to parse user 'libvirt-qemu'
Jul 22 18:00:59 eb2-2259-lin04 libvirtd[1717]: Driver state initialization failed
Jul 22 18:00:59 eb2-2259-lin04 systemd[1]: libvirtd.service: Succeeded.
The status is always inactive(dead). And I get lines invalid argument: Failed to parse user 'libvirt-qemu' , Initialization of QEMU state driver failed: invalid argument: Failed to parse user 'libvirt-qemu' and Driver state initialization failed
I also tried sudo systemctl start libvirtd
and sudo systemctl status libvirtd but the issue doesn't get resolved.
I was actually installing KVM2 driver for GPU support within minikube following the link [https://help.ubuntu.com/community/KVM/Installation][1]. According to the link KVM2 is successfully installed in Ubuntu if virsh list --all cmd does not return an error. For me all the steps returned no error except for the virsh list --all returned the following error.
error: failed to connect to the hypervisor
error: Cannot recv data: Connection reset by peer
and sometimes returns the following error
error: failed to connect to the hypervisor
error: Failed to connect socket to '/var/run/libvirt/libvirt-sock': Connection refused
When I start minikube with kvm2 as the driver using the command minikube start --driver kvm2I get the following error
😄 minikube v1.15.1 on Ubuntu 20.04
💢 Exiting due to GUEST_DRIVER_MISMATCH: The existing "minikube" cluster was created using the "virtualbox" driver, which is incompatible with requested "kvm2" driver.
💡 Suggestion: Delete the existing 'minikube' cluster using: 'minikube delete', or start the existing 'minikube' cluster using: 'minikube start --driver=virtualbox'
Please suggest me how to start minikube with kvm2 as driver.