android - “List of devices attached” is empty on Ubuntu 16.04 using "adb devices"

Question

I am unable connect my Android to Ubuntu.

On executing command lsusb. It shows attached device.

Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 04ca:0061 Lite-On Technology Corp. 
Bus 001 Device 002: ID 148f:5370 Ralink Technology, Corp. RT5370 Wireless Adapter
Bus 001 Device 025: ID 2a70:9011  
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

And I have created rule using this command.

echo SUBSYSTEM=="usb", ATTR{idVendor}=="2a70", MODE="0666", GROUP="plugdev" | sudo tee /etc/udev/rules.d/51-android-usb.rules

And after running adb devices. It is not showing any attached device.

I have also reinstalled adb tools. Even though it is not working.

Answer 1

You need to enable USB debugging on your phone.

This video demonstrates this from 0:33 to 1:03.

Copying the steps here:

1. On your android device, go to Settings→System→About phone. Scroll down to Build number and continuously tap on it for a few times until a popup announcing Developer options to have been activated appears.
2. Go to Settings→Developer options→Debugging and activate USB debugging.

The device should now be listed under $ adb devices once connected.

---

Tested with Android 5.1 and Ubuntu 17.10.