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I downloaded Ubuntu and put it onto a DVD and i assume it works fine because the disk is working. I looked around at the options and noticed that I could install alongside windows, but I chose to just try it. Now I've decided to install it alongside windows(vista) but now the option is no longer there. Any ideas..?

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More details on your windows install and current hard drive partition setup is necessary. This is with 12.10 (latest)? Thanks! – belacqua Oct 26 '12 at 15:45
Current windows is VistaOS and the current partitions are 6.84 free and the rest VistaOS.... – Formaldehyde Oct 26 '12 at 16:00
Do I need to create free space by shrinking the windows part? – Formaldehyde Oct 26 '12 at 16:06
That would typically be good (as you're not getting prompted for the option). Back up your Windows data if you haven't. You can resize in either Windows or Ubuntu/Linux. Just a sanity check -- you have done poweroff and reboot since the last OS load? – belacqua Oct 26 '12 at 16:09
What do you mean? I have powered off several times when there has been no option for alongside installation( to try again, cause I feel like sometimes a reboot fixes things) – Formaldehyde Oct 26 '12 at 16:16

As you suggest, creating free space by shrinking the partition would be a good way to get past this. (Obligatory warning : Back up your Windows data if you haven't.)

You can partition/resize in either Windows or Ubuntu/Linux.

In one case, I had to use a utility in Windows to actually create an ext3 partition in the free space that Ubuntu would see. After that, I was able to boot the Ubuntu DVD, and was finally able to select the ext3 partition and format it to ext4 for Ubuntu without harming the existing Windows installation.

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