It used to be that if wifi was not working you just did 'sudo wlan0
up.' Well, that doesn't work, but 'ifconfig wlan0' got me:

wlp82s0   IEEE 802.11  ESSID:off/any
          Mode:Managed  Access Point: Not-Associated   Tx-Power=off
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:on

So apparently my wifi is now wlp82s0. What an improvement (not!).

So then I did:

$ ifconfig wlp82s0 up
SIOCSIFFLAGS: Operation not permitted
jjj@Devil-Thinkpad:~$ sudo ifconfig wlp82s0 up
SIOCSIFFLAGS: Operation not possible due to RF-kill

Now I'm stuck. What is RF-kill? Where did it come from and why? How do
I make it go away?

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