Finally, I found some time to update my virtual machine, Kubuntu from Feisty Fawn to Gutsy Gibbon. I didn't before because I had to resize the virtual disk, the empty space didn't allow me to do the update. So, the necessary steps are here:
1. resize the virtual disk with:
vmware-vdiskmanager -t 1 -x 12GB KUbuntu.vmdk
the options for command are:
t 1 - growable virtual disk split in 2Gb files
x 12 -GB the new size for disk
2. Now we have a large virtual disk but we still need some work to have
also a bigger disk in Kubuntu. So, change in bios, for virtual machine
to boot from cd in order to resize also the ext3 partition. I used
Knoppix for this task and
Gparted as application.
3. Reboot and change in bios to boot from hdd.
4. Using Adept as is described on Kubuntu site do the update. After about 1 hour I had the last version of Kubuntu installed and a lot of free space.