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Issues with starting a virtual machine using virsh without intializing virt manager

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I am having problems with starting a virtual machine using virsh.

When I do virsh list --all, I see the VM named "ubuntu20.04" and it's state if shut off. Then I do virsh start ubuntu20.04 and get this error:

error: Failed to start domain 'ubuntu20.04'
error: internal error: /run/wrappers/bin/qemu-bridge-helper --use-vnet --br=virbr0 --fd=27: failed to communicate with bridge helper: Transport endpoint is not connected
stderr=/run/wrappers/bin/qemu-bridge-helper: cannot run `/run/libvirt/nix-helpers/qemu-bridge-helper': No such file or directory

I see this problem and think of qemu not initialized or connected properly and turn on virt-manager to see what's the problem and no problem arises there.

After starting virt-manager I have no problems with using virsh start.

Using NixOS 22.05.

Virsh is connected to the same qemu:///session URI as virt-manager.

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