For me, the problem began without touching the hardware switch, I merely turned off wifi in network manager. To me, this issue seems related to https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/997114 , since "airplane mode" was turned on when I turned wifi off.
Once on, I cannot turn "airplane mode" back off, and consequently I can't turn wifi on. Found a workaround here http://askubuntu.com/questions/119195/cannot-disable-airplane-mode
sudo rfkill list all shows that wifi is blocked
sudo rfkill unblock all will unblock it. After that, wireless works again. Until you turn it off via network manager, or turn on "airplane mode", then the problem reappears.
For me, the problem began without touching the hardware switch, I merely turned off wifi in network manager. To me, this issue seems related to https:/ /bugs.launchpad .net/ubuntu/ +source/ network- manager/ +bug/997114 , since "airplane mode" was turned on when I turned wifi off.
Once on, I cannot turn "airplane mode" back off, and consequently I can't turn wifi on. Found a workaround here http:// askubuntu. com/questions/ 119195/ cannot- disable- airplane- mode
sudo rfkill list all
shows that wifi is blocked
sudo rfkill unblock all
will unblock it. After that, wireless works again. Until you turn it off via network manager, or turn on "airplane mode", then the problem reappears.