android devices can't be recognized in adb on ubuntu

Question

i install ubuntu on one mac mini, but when i connected my android devices, it can only recognized some of them. i connect 5 devices, it can only recognized 3 or 4.

output of lsusb

Bus 003 Device 014: ID 2717:9039  
Bus 003 Device 013: ID 2717:9039  
Bus 003 Device 012: ID 2717:9039  
Bus 003 Device 016: ID 2717:9039  
Bus 003 Device 015: ID 2717:9039 

output of adb devices

List of devices attached 
434c05cc        offline
10549306        offline
4c13cb2f        offline

Answer 1

Maybe your PC hasn"t USB Vendor IDs of devices

Look at this page: http://developer.android.com/tools/device.html