Space problem on VM solved by Gpart and Knoppix

Today I had to increase the space on one of my Virtual Machine. On my laptop the host is the Windows and my VMs are Linux. 

My machines are having vmdk as disk, so I had to convert first the vmdk to vdi

VBoxManage clonehd "source.vmdk" "cloned.vdi" --format vdi
VBoxManage modifyhd "cloned.vdi" --resize 16000

After that I've just used the vdi file for my new machine. Ok if the size was increased ( logically) lets do it also on the guest OS. For that I've tried the Gpart Live CD but it didn't work so I had to download the Knoppix LiveCD boot from it in the VM, delete the swap, extend the partition and then adding the swap partition again and of course with the help of the GPart.