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I was trying to install Ubuntu in a dual boot with Windows 10. I tried Ubuntu 20.04 (which had issues with Intel RST and couldn't be fixed, so ignore this version), Ubuntu 18.04 and Ubuntu 16.04. While installing, the Install alongside Windows 10 option is not showing up.

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It seems that my boot drive is not recognized. I have a 512GB SSD and a 1TB HDD. Windows is installed on the SSD and I shrank it to make free space of 100GB. If I click the Something Else option only the HDD is shown during installation.

Screenshot

I've deactivated secure boot and fast startup. And I boot the USB from UEFI, so it should be the same as windows.

enter image description here

karel
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deep_ozean
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    Does this answer your question? ["Install alongside" option missing. How do I install Ubuntu beside Windows using "Something Else"?](https://askubuntu.com/questions/163962/install-alongside-option-missing-how-do-i-install-ubuntu-beside-windows-using) – Pilot6 May 12 '20 at 19:41
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    Instead of 'Install Alongside', use 'Something Else' – K7AAY May 12 '20 at 19:41
  • The problem is I can't see my SSD during installation, where I want to install it. So use "something else" I could only install it on my HDD. – deep_ozean May 13 '20 at 11:17

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Solved it, the problem was the SATA setting. It was set to RAID / RST, but Ubuntu needs AHCI to find the SSD. Followed this tutorial here, but be careful, it may make your computer unable to boot. In my case (Dell G5) it worked but I needed to follow the comments and boot into safe mode to properly boot.

deep_ozean
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