I am running Ubuntu on my computer and I plugged in my tablet to flash TWRP to it. I enter adb devices and here is the output:

juniorRubyist@juniorRubyist-iMac:~$ adb devices
List of devices attached 
????????????    no permissions


Why is it doing this. I have a Kindle Fire 1st Generation, it says that it will ask to authorize ADB, but it will not. It has ADB enabled (I think) and everything.

  • It has ADB enabled (I think) How solid?
    – SarpSTA
    Commented Jun 1, 2016 at 19:40
  • @SarpSTA I read on Amazon that it is enabled by default.
    – Joseph
    Commented Jun 1, 2016 at 19:41
  • Can you check manually?
    – SarpSTA
    Commented Jun 1, 2016 at 19:56
  • Is there a way to disable and renable ADB? Sometimes I have to do that and unplug/replug in the device to get the authorization dialog to come up. Commented Jun 1, 2016 at 20:00
  • 1
    @Izzy Ok, that would be fine with me. I could upvote it later, plus, I only have 1 rep and this isn't my main SE.
    – Joseph
    Commented Jun 2, 2016 at 15:30

1 Answer 1


This is the same for me on Ubuntu. These commands should solve it:

sudo adb kill-server
sudo adb devices
  • This isn't helpful. I already got it fixed.
    – Joseph
    Commented Jun 8, 2016 at 18:53

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