Description of problem:
When a new interface is added from virt-manager (bridge type interface)
e.g br1
Is written in /etc/network/interfaces:
iface br1 inet dhcp
   bridge_ports eno1
   bridge_stp on
   bridge_fd 0.0

But there is something very important missing, up the interface, so that in the next reboot of the system, there will be no interface, and there will be no connection.


Version-Release number of selected component (if applicable):
1.5.1

Steps to Reproduce:
Edit
details of the connection
add interface
bridge
you connect with your interface
system restarts


Solution:
You have to manually edit the file /etc/network/interfaces and add:
auto br1