I have the same problem with the following command.
virt-manager -c qemu:///system
Unable to open connection to hypervisor URI 'qemu:///system':
<class 'libvirt.libvirtError'> virConnectOpenReadOnly() failed could not
connect to qemu:///system
Traceback (most recent call last):
File "/usr/share/virt-manager/virtManager/connection.py", line 332, in
_open_thread
self.vmm = libvirt.openReadOnly(self.uri)
File "/usr/lib/python2.5/site-packages/libvirt.py", line 144, in openReadOnly
if ret is None:raise libvirtError('virConnectOpenReadOnly() failed')
libvirtError: virConnectOpenReadOnly() failed could not connect to
qemu:///system
--
Error starting domain: virDomainCreate() failed Failed to add tap interface
'vnet%d' to bridge 'br0' : Permission denied
https://bugs.launchpad.net/bugs/247677
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