android - * daemon not running. starting it now on port 5037 * ADB server didn't ACK * failed to start daemon * -

i tried ./adb devices ~/android/sdk/platform-tools directory , got * daemon not running. starting on port 5037 * adb server didn't ack * failed start daemon *

i expected this:

list of devices attached ht9cpp809576 device 

if try ./adb kill-server , after ./adb start-server

* daemon not running. starting on port 5037 * adb server didn't ack * failed start daemon * 

if try ./adb nodaemon server illegal instruction (core dumped).

i have 32bit lubuntu 15.04. use android studio. android phone(lg l50) plugged computer.

how can solve issue ?

run tasklist | findstr /i adb see if adb running. if still running, can kill taskkill /f /im adb.exe. restart adb adb start-server