[lxc-users] Error: failed to set group_fwd_mask permission

[ubuntu linux]

Hi,
I am running ubuntu 14.04.4 64 bit and lxd (2.0.0.beta4) from ppa.The kernel version is : Linux N5110 3.19.0-51-generic #58~14.04.1-Ubuntu SMP Fri Feb 26 22:02:58 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
I created a trusty tahr amd64 container and installed unetlab on it.Here is an extract from unetlab's log file when I start a node on a network topology:
sh: 1: cannot create /sys/class/net/vnet0_4/bridge/group_fwd_mask: Permission denied
Mar 03 13:17:34 ERROR: Failed to set group_fwd_mask on bridge (80028).

There's no way I can change the permission of the group_fwd_mask file.And you can tell me to use unetlab's kernel, but the problem is my laptop uses the F** Nvidia optimus and the driver wouldn't compile on unetlab's kernel.
I have only used lxd/lxc for less than a week so I don't know what to do.
Thank you a lot.



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