1. lsusb
at first, we need to know how your computer recognize your android device. Just type "lsusb" and all the usb devices that connect to your computer will be listed. see what you got at the output. in my case, i have a Motorola Milestone, and this is my output:
Bus 001 Device 059: ID 22b8:41db Motorola PCS
remember this and let proceed to second step...
2. sudo vim /etc/udev/rules.d/51-android.rules
and add this line:
SUBSYSTEM=="usb", SYSFS{"Motorola PCS"}=="22b8", MODE="0666"
this helps your computer to know what is this USB device, and hence recognizable
3.
sudo chmod a+rx /etc/udev/rules.d/51-android.rules
service udev restart
restart the USB device service
and your device should be listed as an ADB device by now :)
