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This question already has an answer here:

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.

marked as duplicate by Izzy Jun 2 '16 at 18:12

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  • It has ADB enabled (I think) How solid? – SarpSTA Jun 1 '16 at 19:40
  • @SarpSTA I read on Amazon that it is enabled by default. – juniorRubyist Jun 1 '16 at 19:41
  • Can you check manually? – SarpSTA Jun 1 '16 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. – Austyn Mahoney Jun 1 '16 at 20:00
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    @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. – juniorRubyist Jun 2 '16 at 15:30
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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. – juniorRubyist Jun 8 '16 at 18:53

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