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Whenever I start my computer up I am prompted to choose between Windows and Linux instead of it automatically going to Linux. I guess I screwed up somewhere in the installation process but how can I reverse this so Windows is 100% gone from my life?

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just to add, I installed linux with the wubi installer – robert Sep 15 '13 at 1:39
wubi is not supported by Ubuntu anymore.Its better to do a new installation by booting from a cd or usb – Stormvirux Sep 15 '13 at 3:48

Wubi installs Ubuntu on your existing Windows partition. If you wish to totally get rid of windows, you will need to do a fresh installation using the standard installer (not Wubi) and set it to use the entire disk drive.

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ok thanks for the help – robert Sep 15 '13 at 1:51

Using System Tools, Administration, GParted Partition Editor (requires your sudo password), find the NTFS partition for Windows, unmount it and delete it.

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I might as well ask with another question, when I first installed Ubuntu with wubi, I only allocated 18GB of memory just because it was the default option. If I delete Windows, will all the remaining memory be allocated to my Linux distribution or will it go into limbo or what? – robert Sep 15 '13 at 1:46
My answer is not relevant when Wubi is involved.But yes, deleting the Windows (NTFS) partition means it goes into limbo as unused space. You can reformat it as an ext3/ext4 partition and mount it as extra space, though.. – Phoeey Sep 15 '13 at 2:04

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