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I installed virt-manager on ubuntu 14.0.4 and installed a VM with linux ubuntu trusty. But unfortunately i deleted Virbr0. Now the machine wont work, and ifconfig on host machine does not list virbr0 and i cannot seem to find a way to get back virbr0.

Can someone please help me with this? Anything helps. Thanks!

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1 Answer 1

Reset to default
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Run

virsh net-destroy default
virsh net-start default
service libvirtd restart

or you can add another port using 

sudo brctl addbr virbr0
sudo brctl addif virbr0 eth0

Note: This is not persistent so if you want to permanent then create in /etc/network/interfaces config file (or netplan since 17.10+)

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  • Hey, Firstly thanks for replying, My server is currently down please allow me to fix it and get back to this issue. A small heads up before that, I believe i already tried the above solution but when I type in: Virsh net-destroy. default it produces an error message saying no default found or something. I can copy paste the exact message in a day. Sorry for delay please bear with me, i need help on this.
    – Tk_93
    Sep 2, 2015 at 17:26
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    when you run command virsh net-destroy default then it will destroy default network . so , it may be you have deleted that one so that is not there . so , run command virsh net-start default that will create new default file /var/lib/libvirt/network/default.xml . then restart libvirtd service and still face then reboot host machine . also share if problem not resolved .
    – pl_rock
    Sep 3, 2015 at 2:31
  • error: failed to get network 'default' error: Network not found: no network with matching name 'default' This is the error that i keep getting when I destroy or net-start. Both of them dont work.
    – Tk_93
    Sep 8, 2015 at 19:17
  • i tried to create a bridge but i didnt want to bridge it with eth0, My network keeps going down and doesnt come up when i bridge anything with eth0 and my machine does not turn back on. So can you help me please?
    – Tk_93
    Sep 8, 2015 at 23:12

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