How to do it...

To install libvirt from packages and source follow the following steps:

1. On Ubuntu, install the package by running:

root@kvm:~# apt update && apt install libvirt-bin
root@kvm:~#

1. Ensure that the libvirt daemon is running by executing:

root@kvm:~# pgrep -lfa libvirtd
36667 /usr/sbin/libvirtd
root@kvm:~#

1. Examine the default configuration:

root@kvm:~# cat /etc/libvirt/libvirtd.conf | grep -vi "#"
   | sed '/^$/d'
  unix_sock_group = "libvirtd"
  unix_sock_ro_perms = "0777"
  unix_sock_rw_perms = "0770"
  auth_unix_ro = "none"
  auth_unix_rw = "none"
  root@kvm:~#

1. Disable the security driver in QEMU by editing the qemu configuration file as follows:

root@kvm:~# vim /etc/libvirt/qemu.conf
...
security_driver = "none"
...
root@kvm:~#

1. Restart the libvirt daemon:

root@kvm:~# /etc/init.d/libvirt-bin restart
libvirt-bin stop/waiting
libvirt-bin start/running, process 1158
root@kvm:~#

1. Examine all configuration files in the libvirt directory:

root@kvm:~# ls -la /etc/libvirt/
total 76
drwxr-xr-x 5 root root 4096 Mar 22 14:27 .
drwxr-xr-x 90 root root 4096 Mar 21 23:17 ..
drwxr-xr-x 2 root root 4096 Feb 5 2016 hooks
-rw-r--r-- 1 root root 518 Feb 5 2016 libvirt.conf
-rw-r--r-- 1 root root 13527 Feb 5 2016 libvirtd.conf
-rw-r--r-- 1 root root 1176 Feb 5 2016 lxc.conf
drwxr-xr-x 2 root root 4096 Mar 21 23:16 nwfilter
drwxr-xr-x 3 root root 4096 Mar 21 23:57 qemu
-rw------- 1 root root 16953 Mar 21 23:18 qemu.conf
-rw-r--r-- 1 root root 2170 Feb 5 2016 qemu-lockd.conf
-rw-r--r-- 1 root root 2213 Feb 5 2016 virtlockd.conf
-rw-r--r-- 1 root root 1217 Feb 5 2016 virt-login-shell.conf
root@kvm:~#