If you synced wireless settings (network PSK-s etc.)  from another phone  when you turned on your Nexus 5 it may be unable to connect to wireless networks automatically – or not at all.

Short term solution is to type in the PSK and save it then go to the Airplane Mode – stay there one minute, and turn off the Airplane mode. This will make Nexus 5 connect to the network that’s in range but it will fail to switch to others.

To solve problem completely use this solution (provided that the phone is rooted and usb debugging is on) from adb shell:

You can type same commands on the terminal emulator on the phone if you have one installed.

Thanks to wonderful people on the internet:

https://code.google.com/p/android/issues/detail?id=61945#c13

 

 

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