lsusb lists Galaxy Samsung Tab s2 & adb devices lists nothing really, I do all my efforts  to run an android project through eclipse on a tablet "Samsung galaxy Tab s2/ GT-P3100" under linux (Ubuntu 12.04). 

i add the vendor id of samsung  in  ~/.android/adb_usb.ini 

   0x04e8


i add rules in /etc/udev/rules.d/51-android.rules as following : 

SUBSYSTEMS=="usb", ATTRS{idVendor}=="04e8", ATTRS{idProduct}=="6860", MODE="0666"
ACTION=="add", SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", ENV{ID_USB_INTERFACES}=="*:ff420?:*", MODE="0666"


then , i restart udev  &amp; i run the following command

sudo udevadm control --reload-rules


i updates  /etc/udev/rules.d/99-android.rules

SUBSYSTEM=="usb", ATTRS{idVendor}=="04e8", SYMLINK+="android_adb", MODE="0666"


the thing that perplexed me is the listing of the tab when running the following cmd : 

abdennour@estifeda1:~$ lsusb 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 003: ID 125f:a11a A-DATA Technology Co., Ltd. 
Bus 002 Device 003: ID 413c:2107 Dell Computer Corp. 
Bus 002 Device 004: ID 046d:c077 Logitech, Inc. 
Bus 001 Device 009: ID 04e8:6860 Samsung Electronics Co., Ltd GT-I9100 Phone [Galaxy S II]


And the device also is well mounted: 


I finally recourse a very long solution but, as usual, in vain :
i found the solution , it is a device matter and not Host matter: Hence, i am right when i wrote this question in https://android.stackexchange.com/ and not in askubuntu exchange. 

Go to Settings &gt; Developer options&gt; Developer options .

Then, check : USB Debugging