1. Getting the ISO
We need the Feisty iso image first, so download it from here (by the time of writing it's "Herd 4", I installed "Herd 3").
2. Creating an new virtual machine
Now it's time to create a new virtual machine (vm). Start VMware server console ("Applications -> System Tools -> VMware Server Console") and click "Create new virtual machine". Select "Custom", "Version -> Ubuntu". You may then choose a name for you new vm. Then, leave the defaults except:
- Memory: 512MB (depending on your system's physical RAM...)
- Network Connection: "NAT"
- VirtualDisk type: "IDE"
After clicking "Finish" the new virtual disk will be created, this may take some time depending on the selected size (8GB should be OK).