![]() ![]() ![]() I encountered this problem as I had previously used adb to install a ROM on another computer so my phone needed reauthorisation to connect again. Do a “adb kill-server” on reconnecting to your PC and then restart and you should see the same alphanumerical code followed by “device” meaning that you now have access to your phone. ![]() On reconnecting the cable your device will display a pop-up asking for your permission using an RSA key to allow connection to this computer.Go to Settings > Sytem > Advanced > Developer options and under Debugging hit “Revoke USB debugging authorisations” after deconnecting the USB cable.When running the command “adb devices” you then get the alphanumerical serial number followed by “unauthorized” then you have a problem with your USB debugging setup in the Developer options.After installing the above packages, then connecting your device via USB cable, you need to start the server.I don’t know if this is any different on a Ubuntu system (probably not) but my MX-Linux running the latest Debian Buster ran into problems identifying my OnePlus 5T device. I decided to add this little HOWTO in case others encounter the same problems I had when first installing the adb and fastboot tools for Android, as mentioned above. How to solve the “unauthorized” mention when using ADB on a Debian system. ![]()
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