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I began to install Ubuntu, but got a message about UEFI/BIOS compatibility and how I wouldn't be able to boot both.

If I install as UEFI, will I be able to reinstall Windows 7 as UEFI? Or should I just install Ubuntu in legacy mode?

Kaz Wolfe
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Mixx
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    The details of the question aren't quite identical, so I don't consider your question a duplicate, but in addition to Kaz Wolfe's answer (which is good), you may want to read [this question and my answer to it](http://askubuntu.com/questions/647303/uefi-or-legacy-which-is-advised-and-why/647604#647604) and [this question and its answers](https://superuser.com/questions/496026/what-is-the-difference-in-boot-with-bios-and-boot-with-uefi/501867#501867) on SuperUser. My [Linux on UEFI page](http://www.rodsbooks.com/linux-uefi/) may also be of interest. – Rod Smith Mar 29 '17 at 13:18

2 Answers2

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To prevent needless complication, I would advise that you install Ubuntu in the same fashion that Windows is currently installed.

So, if Windows is installed as UEFI, it would be best to install Ubuntu under UEFI such that you don't need to swap bootloader modes or reinstall Windows to change OSes. Similarly, if Windows is in Legacy mode, install Ubuntu in the same.

If it really doesn't matter to you, though, I'd highly suggest using UEFI. It offers many more features that can come in handy on modern systems, and can allow for better compatibility with graphics and hardware stacks on modern systems. All in all, though, it really doesn't matter after you get past the bootloader.

Kaz Wolfe
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if you choose to install both in UEFI mode make sure you have an EFI partition (250mb will be enough) as without this partition your OS will not boot

(if your windows 7 is in UEFI then i'm pretty sure you have this partition already)

Does Ubuntu need this EFI partition?

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Sumeet Deshmukh
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