Comment 1 for bug 82711

Thank you for your report. Could you try the following please.

open a terminal and type the following.

sudo cp /etc/network/interfaces /etc/network/interfaces.bak

then the following.

sudo gedit /etc/network/interfaces

scroll down the text till you get to the auto ra0 .....

Delete the two lines with ra0 in then save the file. then reboot your laptop. If that doesn't work you can do.

sudo rm /etc/network/interfaces

then

sudo mv /etc/network/interfaces.bak /etc/network/interfaces

and reboot that will reset to your original settings.