It looks as if you don't have non-root permissions to use the tun device. Do the following:
$ sudo addgroup tun $ sudo adduser $(id -un) tun log-out and log-in again to effect the new group membership, then check "tun" is listed in the user's groups: $ groups Now follow the instruction in my 'Virtual Machines with VDE Networking' tutorial, in the section "Give New Devices tun Group Ownership" http://tjworld.net/wiki/Linux/Ubuntu/VirtualMachinesWithVDENetworking#GiveNewDevicestunGroupOwnership You can manually set the permissions to avoid requiring a system restart: $ sudo chown :tun /dev/net/tun $ ls -l /dev/net/tun crw-rw---- 1 root tun 10, 200 2008-07-02 10:49 /dev/net/tun Now try the virt-manager procedure again. You *might* need to reboot to ensure the permissions are set correctly by the udev rule in the future. -- Error starting domain: virDomainCreate() failed Failed to add tap interface 'vnet%d' to bridge 'br0' : Permission denied https://bugs.launchpad.net/bugs/247677 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
