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I have 4 primary partitions already, and I want to make a partition for installing ubuntu, but I get the error that there can't be more than 4 primary partitions, is there a way that I can put two of the existing partitions inside an extended partition, without loosing any data? Edit: all the partitions are NTFS.

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So, you still haven't installed Ubuntu, Right? – Mitch Jul 9 '12 at 10:13
No. I haven't yet. – Untitled Jul 9 '12 at 10:57
You can't do a direct conversion, as far as I know, you'd have to make clone copies of one (or more) of the ntfs partitions, delete it/them, create an extended partition in its/their place, create a/some logical partitions and restore the cloned partition(s) to it/those. Mind not to do this with a partition that holds the main operating system, I don't think windows likes being booted off a logical partition. – arand Jul 9 '12 at 11:47
up vote 2 down vote accepted

Since you haven't installed Ubuntu yet, and still on windows then you may want to take a look at this. EaseUS.

It will allow you to do the conversion without loosing any data, and its free

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