Comment # 6 on bug 1187454 from Stuart Rogers

I have this issue as well. I see the same messages. I have not tried the
suggestion as it did not work for the original reporter. I also find it is nigh
on impossible to clse the laptop down as Network Manager will not stop so I
have to clse it with the power button - not good. While the laptop is booted it
will run OK on wifi and if I disable wifi and use the cable connection is shuts
down OK.

Have you any other suggestions as to how to resolve this?