If mint14 is controlling grub then all you need to do is to delete the mint10 partition. If mint14 is not controlling grub then make sure it is by booting into it and running
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sudo grub-install /dev/sda
Which assumes that sda is the drive that mint 14 is installed on, if it isn't then change the command to the drive it is installed on.
If you don't like the sound of that then try this instead:https://help.ubuntu.com/community/OS-Uninstaller
Fujitsu Lifebook AH532 Laptop. Intel i5 processor, 6Gb ram, Intel HD3000 graphics, Intel Audio/wifi. Realtek RTL8111/8168B Ethernet.Ubuntu12.10 (Unity), Mint14 (Cinnamon), Manjaro (Xfce).