Sorry Peter that doesn't work in Mint Update. If you want to update versions you have to reinstall. I know it works in Ubuntu and of course Mint is Ubuntu based but the Mint developers do not like the idea of version updates through the update tool so have not included that function with the tool.
Fujitsu Lifebook AH532. Intel i5 processor, 6Gb ram, Intel HD3000 graphics, Intel Audio/wifi. Realtek RTL8111/8168B Ethernet.Lubuntu 13.10,Ubuntu12.10 (Unity), Mint16 (Cinnamon), Manjaro (Xfce).