USB Debugging on Samsung Galaxy Tab Using Ubuntu

If you are developing android applications using either the Samsung Galaxy Tab 7" or the 10.1", chances are you'll have a hard time using adb to these devices.  If you have followed these instructions in the android developer site and you find it working for you, then congratulations!  In my case, it's different.  Restarting the udev and adb doesn't work for me.  When I try the command adb devices, it shows,

$ adb devices
List of devices attached
????????????    device

and if I check the devices attached to my machine using lsusb it shows,

$ 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 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 0a5c:21bc Broadcom Corp. BCM2070 Bluetooth 2.1 + EDR
Bus 001 Device 005: ID 04e8:6860 Samsung Electronics Co., Ltd GT-I9100 Phone [Galaxy S II]

Samsung handles these attached devices differently.  I'm still not sure what causes this but it has something to do with the MTP (Mobile Transfer Protocol).  So what I did, I googled for answers and found this answer from stack exchange.  Thanks to this guy a.k.a Flow.  I guess this may work for you.  So go ahead and check his answer and don't forget to upvote it.