OPTION ONE
Using Wubi Installer
Step 2: Select the hard drive where you wish to install it on. Keep in mind it will NOT erase Windows.

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Step 3: Select the amount of space you want to give tos Ubuntu to use.
Step 4: Select your desktop enviornment. This is personal prefernce, if new to Linux then sticking with Ubuntu.
Step 5: Select your language.
Step 6: Set your screen name.This cannot contain capitalized letters of any kind.
Step 7: Set your password. When you have completed that hit the install button and wait!
Step 8: When it finishes downloading and installing Ubuntu, just restart to boot into Ubuntu!
NOTE: Please bear in mind that the WUBI installation method installs Ubuntu as if it is an application on Windows. It does NOT use its own partitions.
OPTION TWO
Native Install
Step 1: Burn a CD/DVD with the Ubuntu ISO through Windows.
Step 2: Boot from the CD/DVD when you start up your computer.
Step 3: Press the up button the moment something appears on that screen and select a language.

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Step 4: Select the option ‘Try ubuntu without installing’.

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Step 5: When the desktop appears double click the icon on the desktop called ‘Install Ubuntu’.

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Step 6: When the installer launches fully, select your language and hit the foward button.

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Step 7: On this screen you’ll want to choose that options you want.

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Step 8: On this screen you’ll want to select the ‘specify partitions’ option and click foward.

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Step 9: Here as you can see we already have some unallocated space, click it and select the ‘Add’ button. (Note: You can select an already created partition, make sure not to overwrite your Windows partition!)

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Step 10: A window should pop up, you should make the mount point ‘/’ and the ‘Use as’ EXT4 filesystem. Click Ok when done.

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Step 11: After that click the ‘Install Now’ button and follow the onscreen instructions.
Step 12: You’ll be prompted to reboot after its finished, reboot and select the top option in the Grub 2 Boot Loader and you’re now in Ubuntu!