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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?.

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  • I doubt it, Shutdown and Reboot are exactly identical ! Are you really rebooting? Jun 27, 2016 at 13:08
  • @Sharad Gautam Yep. when I shut down and restart, then no problem. If I restart directly, then no wifi.
    – dhiya
    Jun 27, 2016 at 13:30
  • This too related askubuntu.com/questions/761180/…
    – dhiya
    Jun 27, 2016 at 13:38
  • This my friend is a common problem with many Wifi Adapters. Even with my Windows 10 system (using windows 7 drivers. All you can try is installing different drivers. Good Luck! Jun 27, 2016 at 16:33
  • Disable Secure Boot.
    – Pilot6
    Jul 22, 2016 at 13:54

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