Ubuntu: WiFi connection does not work on Ubuntu 14.04.4



Question:

My wifi has been working well for a few weeks, but maybe after some upgrades of software, it does not work now and I can not find the signal of wifi now. I have tried to reinstall 14.04 for several times but it still fails to connect wifi. The information of my problem is here


Solution:1

It would help if you had specified what Ubuntu release and which hardware you are using, but you might:

  1. Remember the current kernel version (uname -r).

  2. Reboot, holding the Shift key, and selecting an older (lower version number) kernel to boot. Select progressively older kernels until you find one under which your wifi works.

  3. Install the linux-kernel-extras package for the kernel version remembered from step 1. It will be called something like linux-image-extra-4.4.0-31-generic, (if you remembered 4.4.0-31 from step 1), YMMV.

  4. Reboot.

I'm using a wifi dongle supported by the rt2800usb module, and had to do this recently.


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