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I've been using Ubuntu for a while now. I still have windows installed and it's taking up the majority of my hard drive space. I want to fully switch to Ubuntu though. I've backed up everything I need from Windows and I'm ready to get rid of it. I just don't know how to do it. Here is a Screenshot from gParted.

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Using gparted you should be able to select the ntfs partitions you want to delete and delete them - Once deleted you have to format the unpartitioned space into ext4 or fat32 (again using gparted) - If you dont want to completely remove windows you can shrink the windows partition down using diskmgmt.msc from windows

If you decide to completely remove Windows via gparted as described you will have to either 1) flag your sda5 partition as boot or 2) create a new partition for /boot and and move the files from its current location to the new /boot partition. Also you will want to remove windows from the grub menu -

A tool that I use to 'fix' my grub boot loader is (http://sourceforge.net/projects/boot-repair-cd/files/) - I have this installed on a usb that i keep in my toolbox

If you want to manually do this:

Make a bootable disk for Gparted - (http://gparted.org/livecd.php) I use this to make bootable usb's - (http://unetbootin.sourceforge.net/) - however you want will be good bud.

Gparted can be used to make a boot partition (mine is formatted ext2 but i dont think theres any issue with making it all ext4) - minimum size of this partition is 200 mb (you dont want it to be too big at all) and you will want to flag it as /boot.

Some examples for you: (Things are named aptly so you can logically see the process)

/dev/sda2 - 200 MB new boot partition
/dev/sda1 - 50 GB existing linux partition 

Make mount points.

mkdir /mnt/newboot /mnt/existing

Mount the partitions:

mount /dev/sda2 /mnt/newboot
mount /dev/sda1 /mnt/existing

Copy /boot files:

cp -a /mnt/existing/boot/* /mnt/newboot/

Unmount the boot partition from /mnt and remount to /boot:

umount /dev/sda2
mount /dev/sda2 /newboot

To remove windows from Grub:

sudo gedit /boot/grub/grub.cfg

You can (put a #) in front of each line to "comment out" the entries pertaining to Microsoft Windows - or if you are comfy with just deleting them - so be it. I usually make a copy of any conf file i mess with and save it in my home dir just in case i screw something up.

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    This answer may benefit from a word on Grub and the boot partition.
    – Takkat
    Jul 29, 2015 at 7:25

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