Universal Blue•2mo ago

Can't create a virtual network in KVM Manager

I installed all the nescessary KVM stuff via rpm-ostree. I can create virtual machines just fine, but I can't create virtual networks. How can I fix it? Error message:

Error creating virtual network: error creating bridge interface virbr0: Operation not permitted

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 71, in cb_wrapper
    callback(asyncjob, *args, **kwargs)
    ~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/share/virt-manager/virtManager/createnet.py", line 428, in _async_net_create
    netobj.create()
    ~~~~~~~~~~~~~^^
  File "/usr/lib64/python3.13/site-packages/libvirt.py", line 3569, in create
    raise libvirtError('virNetworkCreate() failed')
libvirt.libvirtError: error creating bridge interface virbr0: Operation not permitted

Error creating virtual network: error creating bridge interface virbr0: Operation not permitted

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 71, in cb_wrapper
    callback(asyncjob, *args, **kwargs)
    ~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/share/virt-manager/virtManager/createnet.py", line 428, in _async_net_create
    netobj.create()
    ~~~~~~~~~~~~~^^
  File "/usr/lib64/python3.13/site-packages/libvirt.py", line 3569, in create
    raise libvirtError('virNetworkCreate() failed')
libvirt.libvirtError: error creating bridge interface virbr0: Operation not permitted

11 Replies

wolfyreload•2mo ago

Your user might not be in the right group to have permission to do that. Try running ujust setup-virtualization group from the terminal and see if that makes a difference You might need to reboot or log out and in again after that for the change to take effect

StarMageOP•2mo ago

It didn't make a difference

HikariKnight•2mo ago

use the system session user session does not have permission to do anything

StarMageOP•2mo ago

System session also has this issue

HikariKnight•2mo ago

can you layer virt-manager and see if that has the same issue because this could be another limitation for the flatpak version

StarMageOP•2mo ago

virt-manager is installed via rpm-ostree as well

HikariKnight•2mo ago

hmm i cant replicate it on the system session

HikariKnight•2mo ago

StarMageOP•2mo ago

Strange. I think I installed everything right with rpm-ostree install virt-install libvirt-daemon-kvm qemu-kvm virt-manager virt-viewer libguestfs-tools python3-libguestfs. I didn't install libvirt-daemon-config-network because it was "already provided". Right now I installed it with rpm-ostree install libvirt-daemon-config-network --allow-inactive just in case and rebooted. But it still doesn't work. Should I delete it all and install again?

HikariKnight•2mo ago

we install through ujust setup-virtualization

StarMageOP•2mo ago

Thanks. I should have used ujust from the start but I forgot about it

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Can't create a virtual network in KVM Manager

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