Dual boot LM & W7 - Need help on updating LM

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I have Linux Mint installed along with windows 7 as dual boot.Linux mint is the primary , ie first partition is for LM. Current LM version is 12 , i want to update it or if possible even move to ubuntu. But really love cinnamon though. Started trying , then left it like that . But again , want to give more time to Linux Mint.So how to i upgrade my current LM to latest version ?
 
Err..using Software Update option in your distro? Or are you asking something else?
 
I too have been wanting to upgrade my Ubuntu but am scared it is going to screw my grub. Don't have too much time to fix everything.
 
I heard that main version of LM should be installed using CD or something , and cant be upgraded within the OS. Yup , I too dont want to screw the grub.also is it possible to move from LM to ubuntu ? without disturbing the W7 and other partitions ?
 
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