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I have a Lenovo computer equipped with Win8.1. I'm trying to install Kubuntu 15.10 when the following message appeared:

"force UEFI installation?...this machine's firmware has started the installer in UEFI mode but it looks like there may exist operating systems already installed using "BIOS compatibility mode"...If you wish to install in UEFI mode and don't care about keeping the ability to boot one of the existing systems, you have the option to force that here......".

When I've chosen Continue button or Go back button, I've got the same page "disk setup" where I can customize disk partitions. All partitions are displayed properly.

Can I continue without having problems with the two OS?

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First off, i would check my BIOS to see if you have Safeboot enabled. I think you would not get this warning if this is turned off.

Press F1 at boot, enter BIOS and disable safeboot.

Run the installation again.

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  • there is no option for safeboot. I have got : boot mode = Legacy support. Boot Priority = UEFI first. USB boot = Enabled. PXE Boot to LAN = Enabled.
    – Nasreddine
    Mar 6, 2016 at 14:50
  • That option is not on the same page. I think its at the end with save and exit. Can you please have a look? I could restart my server and look but id rather not. And please have a look at this: askubuntu.com/questions/221835/…
    – Izzno
    Mar 6, 2016 at 16:29
  • I've changed only Boot Priority to Legacy first. And worked perfectly. Thanks.
    – Nasreddine
    Mar 6, 2016 at 19:34

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