"vagrant sandbox on" return "connection to libvirt error"

[GSergeevich]

german@german-HP-ProDesk:~/vagrant/nop$ vagrant sandbox on
Error while connecting to libvirt: Error making a connection to libvirt URI qemu://localhost/system?no_verify=1&keyfile=/home/german/.ssh/id_rsa:
Call to virConnectOpen failed: Cannot read CA certificate '/etc/pki/CA/cacert.pem': No such file or directory

Only if I set :

	config.vm.provider :libvirt do |libvirt|
           libvirt.driver = "kvm"
           libvirt.host = ''

in Vagrantfile ,it works for me.

Perhaps it's worth adding the ** uri ** option from the vagrant-libvirt provider for an accurate definition :
libvirt https://github.com/vagrant-libvirt/vagrant-libvirt#provider-options

Now the option has no effect :

	config.vm.provider :libvirt do |libvirt|
           libvirt.driver = "kvm"
           libvirt.uri = "qemu:///system"

german@german-HP-ProDesk:~/vagrant/nop$ vagrant sandbox on
Error while connecting to libvirt: Error making a connection to libvirt URI qemu://localhost/system?no_verify=1&keyfile=/home/german/.ssh/id_rsa:
Call to virConnectOpen failed: Cannot read CA certificate '/etc/pki/CA/cacert.pem': No such file or directory

[dthpulse]

just change the line

conn_attr[:libvirt_uri] = uri

to

conn_attr[:libvirt_uri] = 'qemu:///system'

in file

/qemu/vagrant/.vagrant.d/gems/2.6.5/gems/sahara-0.0.17/lib/sahara/session/libvirt.rb