While following a tutorial to install qemu on an atom base Debian, I had an error with a missing dependency.
To solve it, add to your /etc/apt/sources.list the following line:
deb http://ftp.de.debian.org/debian jessie main
Then
apt update
apt install qemu-kvm qemu virt-manager virt-viewer libvirt-bin
I then had the following error while trying to create a new virtual machine :
Unable to connect to libvirt.authentication unavailable: no polkit agent available to authenticate action ‘org.libvirt.unix.manage’ qemu
This was due to the fact that the user starting the virtual machine manager has to be in the libvirt group. To solve the problem:
sudo adduser [user] libvirt
I then had (yet) antother error message:
Could not start virtual network ‘default’: internal error: Failed to initialize a valid firewall backend
To fix it, I just had to install firewalld
sudo apt install firewalld
