Commenting here since it seems more active than the thread it's supposed to be a duplicate of:
I just installed 15.04 on a lenovo E330 with a r8169 wireless chip and have this problem. Wifi connecting on startup, but after suspend, I have to deactivate wireless and reactivate to get a connection. Never had the problem with neither 14.04 nor 14.10.
Commenting here since it seems more active than the thread it's supposed to be a duplicate of:
I just installed 15.04 on a lenovo E330 with a r8169 wireless chip and have this problem. Wifi connecting on startup, but after suspend, I have to deactivate wireless and reactivate to get a connection. Never had the problem with neither 14.04 nor 14.10.