no permissions (user in plugdev group; are your udev rules wrong?)

Question

The commands flutter devices and adb devices are giving me the same error:

adb devices List of devices attached FA69H0308097    no permissions (user in plugdev group; are your udev rules wrong?); see [http://developer.android.com/tools/device.html] 

flutter doctor detects my old Nexus 5, but, with my Pixel phone, I get the permission error. Pixel phone is in debug mode. The output from flutter doctor on Ubuntu 7.10 is

flutter doctor Doctor summary (to see all details, run flutter doctor -v): [✓] Flutter (Channel beta, v0.1.5, on Linux, locale en_AU.UTF-8) [✓] Android toolchain - develop for Android devices (Android SDK 27.0.3) [✓] Android Studio (version 3.0) [✓] VS Code (version 1.21.0) Error retrieving device properties for ro.product.cpu.abi: error: insufficient permissions for device: user in plugdev group; are your udev rules wrong? See [http://developer.android.com/tools/device.html] for more information  [✓] Connected devices (1 available) 

How can I enable my computer to access my Pixel phone?

Answer 1

With my Pixel phone plug into the computer, in the notification shade, I changed it from USB "Charge this phone" to "PTP" (Picture Transfer Protocol).

I then ran flutter doctor and my Pixel asked me to "Allow USB debugging" for my computer, I ticked the box to "Always allow from this computer".

I found the solution via https://github.com/flutter/flutter/issues/10330, which pointed to another Stack Overflow post.

Answer 2

change the usb connection options to PTP. That worked for me.