It's sounds rediculious but I fonud that kubuntu 12.04 doesn't use fstab anymore. Ti assure you I suggest to perform an experiment:
- press "Alt+F1" > "System Settings" > "Removable Devices". There you shoud enable automatic mounting of removable media (choose any partition you like).
- restart you computer
- open: "/media" folder with "dolphin" to ensure that the selected partition has been mounted.
- now look in to your "fstab" file
Could anybody explain why there is no record in fstab while partition is mounted automaticaly?