Makes it a little complicated for someone new to installing Ubuntu, with all the having to set boot partition etc. I wish I could explain it easier for you. Basically split the Windows partition (one hdd) and install it on the second partition. You'll get a bootloader that will automatically allow you to boot into Ubuntu/Windows.
You have two options. Well a few, depending on what your HDD setup is.
If you want it on the same drive, either install to a blank partition, or resize your current one and install a side by side. For that, the install disc of your flavor should do that all on its own. You can also accomplish it with gparted. Burn that to disc and boot into it, and shrink/resize your windows partition to leave whatever space you want. After that, you can use your install disc and select the blank partition during the installation. If it asks you if you want to install the bootloader to the MBR, say yes.
For future knowledge, it's always best to install linux last and use its bootloader (GRUB) to manage your OSes because it is the most versatile, and not to mention windows will not recognize linux partitions.
It's fairly automated, but if you have more questions post back.
Choose System --> Administration --> (Gnome) Partition Manager - it may be called gParted
You should see that the bar is a teal- this means it is formatted as NTFS, which is a windows partition. Drag the slider to make this bar smaller. You may see a another one which is the recovery partition some manufacturers use these days.
Don't try to create linux partitions and Click apply, when your happy. There is no going back after this step.
After this exit the partitioner and click on the install icon.
Go through the installer as normal until you reach the "Partition Hard Drrives." Do not choose 'guided' or try to partition the hard drive using the installer - as you have done that already.
Instead, select Use "Largest Continuous Free Space" - ubuntu will install itself in the free space you created by shrinking the NTFS partition.
Click OK, run through the rest of the installer. You will want to install grub, and ubuntu should do the rest. It should even recognise your windows partition's data and stuff.
Click install if your ready to take the plunge...and good luck.
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