How to make room for an additional distro

[John D. Herron]

Hi, all.

I'm running a Windows-free Intel 32-bit machine with Ubuntu 12.04 
preinstalled on a 1 TB harddisk in a single partition which seems to 
span the entire HDD, although at this time it occupies only about 25 GB 
of space.
Would like to install and dual-boot the latest Linux Mint alongside with 
the Ubuntu.
How do I go about doing that without ruining the original Ubuntu content?
Thanks for helping out.

jdh

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