Removing windows keeping ubuntu intact

That depends on how you installed Ubuntu.

If you used Wubi then backup, reinstall and copy your personal data back.

If you did a proper dual boot from CD/DVD or USB stick, you can just remove Windows as explained here:
http://askubuntu.com/questions/784/how-do-i-remove-windows-but-keep-ubuntu

What is the output of:

sudo fdisk -l; mount; uname -a; lsb_release -a

Thanks

In case of wubi which portion should i take backup of?

On 3/3/13, actionparsnip <email address hidden> wrote:
> Your question #223275 on Ubuntu changed:
> https://answers.launchpad.net/ubuntu/+question/223275
>
> actionparsnip requested more information:
> What is the output of:
>
> sudo fdisk -l; mount; uname -a; lsb_release -a
>
> Thanks
>
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> To answer this request for more information, you can either reply to
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Boot to Ubuntu

Copy all of the following directories including hidden files to external drive or CD/DVDs

/home
/etc
/var

Install Ubuntu fresh letting it use the entire drive

Copy everything back to your home directory

You may or may not need stuff from /etc and /var do not copy those back yet. If you have problems ask again and we will tell you which specific files you need to copy, if any.

Will it bring all the softwares back, which i downloaded?

On 3/5/13, Warren Hill <email address hidden> wrote:
> Your question #223275 on Ubuntu changed:
> https://answers.launchpad.net/ubuntu/+question/223275
>
> Status: Open => Answered
>
> Warren Hill proposed the following answer:
> Boot to Ubuntu
>
> Copy all of the following directories including hidden files to external
> drive or CD/DVDs
>
> /home
> /etc
> /var
>
> Install Ubuntu fresh letting it use the entire drive
>
> Copy everything back to your home directory
>
> You may or may not need stuff from /etc and /var do not copy those back
> yet. If you have problems ask again and we will tell you which specific
> files you need to copy, if any.
>
> --
> If this answers your question, please go to the following page to let us
> know that it is solved:
> https://answers.launchpad.net/ubuntu/+question/223275/+confirm?answer_id=3
>
> If you still need help, you can reply to this email or go to the
> following page to enter your feedback:
> https://answers.launchpad.net/ubuntu/+question/223275
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> You received this question notification because you asked the question.
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No they will need to be downloaded again. Sorry but with a Wubi install Ubuntu is a virtual file system in windows so if you lose Windows you lose Ubuntu. So your choice is keep Windows or fresh install.

You can however get a list of what you have installed and compare that with what a fresh install has installed.
See this question for more details
https://answers.launchpad.net/ubuntu/+source/apt/+question/214268