I just upgraded my Ubuntu Linux system to Karmic Koala [ 9.10 ] from Gutsy Gibbon [7.04]. As you can tell, it had been some time since I had upgrade. The good news is that the upgrades, through 8.04, 8.10, 8.04, to 9.10, went without a hitch, although they took over 3 hours.
And network file sharing, SAMBA or SMB, works without a hitch with no modifications to the built in configuration. Hurray!!!. You may remember a previous post about Ubuntu Not Playing Nice that showed the modifications that I had to do to BIND and to SMB configuration to get things to work. UPDATE: file sharing worked because I had fixed it in Gutsy. It still DOES NOT WORK OUT OF THE BOX with Karmic Koala.