After upgrading to 16.04, the wifi is not connecting whenever I restart the system. It shows 'device not ready'. My Wireless interface of Ubuntu is RT3290 Wireless 802.11n 1T/1R PCIe
on iwconfig I got the following
lo no wireless extensions.
wlan0 IEEE 802.11bgn ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=0 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:off
eth0 no wireless extensions.
Currently to start wifi again I have to shutdown, then boot the system again.
sudo systemctl restart network-manager.service
or
sudo service network-manager restart
doesn't starts wifi.
How to fix the problem?.