Ubuntu won't detect windows 10 when I try to install it, so I'm assuming it is because my BIOS is not in UEFI mode, but rather, in Legacy mode. Is there any way for me to still be able to install ubuntu alongside my windows installation?
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Which version of ubuntu are u referring to? Ubuntu gives you the possibility to install it in legacy mode as well. Have you allocated space on the disk for Ubuntu? Take a look here: ubuntuforums.org/showthread.php?t=2236762– orestisJan 9, 2016 at 22:49
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@orestis Not sure right now but it's either 14.04 or 15.10. No I haven't but I shall do that now. The thread starts getting a bit technical so I'm not too sure what they are doing there. But my guess is that I will have to install ubuntu onto the unpartitioned space and then maybe do something else to make it have a boot option? I really don't know– Dominik HJan 9, 2016 at 22:58
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windows 10 only works in uefi mode (i think), so you probably need to reinstall ubuntu in UEFI mode, disable Secure-boot in bios and fast-boot on windows first, at least i did that with windows 8 and it worked– philsegelerJan 9, 2016 at 23:15
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@philsegeler right so I'll disable secure boot in the bios, and is fast boot a windows option or a bios option? Also why does my System Information say that the Bios is on Legacy mode? This must mean that Windows 10 works on Legacy too?– Dominik HJan 9, 2016 at 23:17
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by default windows works in uefi mode, you need to reset the bios to uefi mode, go to windows to disable fast startup superuser.com/questions/957081/… then reinstall Ubuntu in UEFI mode– philsegelerJan 9, 2016 at 23:19
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2 Answers
Well, I am a new 'Ubuntuan' (permit me to use that word) too!
This is my first answer on the forum, I hope to give it a good try.
From what you said, i presume you have a working windows 10 OS!
Download the Ubuntu ISO image from the Ubuntu website here.
Download Rufus to setup a USB drive to be used as boot manager.
Open rufus after download
Select the drive you want to install on.
Select the partition scheme for both legacy and UEFI modes
Leave file system and cluster size as default
In the Create bootable disk using option, select ISO Image, then click the icon beside to pick the Ubuntu ISO Image you downloaded.
Then click start to start the operation.
You should know when the process is done.
However, due to Windows Fast Boot options, your computer might boot directly into Windows 10 without booting from the Ubuntu Boot manager you created (Which i assume is connected to your system). You can force your system to load your external drives by Reordering the Boot Options in your BIOS setup. And some computers will give you access to select which drive to boot from when you press a specific key (mostly F12 or ESC key) immediately your computer powers on.
Then select the USB Bootable manager you created, and UBUNTU should load then. Follow the download process to install Ubuntu and enjoy freedom for life! Thanks.
Correction
@philsegeler 's comment in the question is not true.
Windows 10 supports both UEFI and Legacy mode. You need to check your Windows installation BIOS mode following this answer.
Answer
You need to boot Ubuntu image from Generic Flash Disk (NOT UEFI: Generic Flash Disk) in BIOS boot option to install alongside with Windows in Legacy mode.
According to the documentation, the Secure Boot is only available in UEFI. If you have Windows in Legacy mode, I think you don't need to turn that off in your BIOS setting. As you could see the "Secure Boot State" in System Information Utility will be "Unsupported".
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If I use a Ubuntu Installation usb, I should find 'Generic flash disk' from BIOS menu ? I installed Ubuntu in UEFI and windows is in BIOS, now I can't boot to any... Is there a way to boot back to windows? Jan 10, 2021 at 6:08