kitkat usb connection problem my galaxy grand 2 cannot connect the sd card of usb storage to computer. only 2 options are available with usb
namely
media device
camera
how can I access the files of sd card and usb storage

Please note that Im using Ubuntu 14.04

I have no problems with windows
Ubuntu 14.04 seems to have some issues with MTP working correctly. You need to install the mtpfs and make sure the phone usb connection is set to MTP to work.

See the Ubunto syack exchange for more info. https://askubuntu.com/questions/463015/ubuntu-14-04-and-android-cant-see-phone-on-my-computer