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I recently bought a Dell Precision 7530 laptop which came preinstalled with Ubuntu 16.04 on a 500GB SATA drive. Later I bought a 1TB M2 PCIe NVMe SSD and installed it in a free slot in addition to the original SATA drive. enter image description here

I then installed Ubuntu 19.10 on the new SSD drive. This did however not work, see my previous question.

Later, I tried to physically remove the SATA drive and then it booted fine into Ubuntu 19.10 on the M2 PCIe SSD. Now I thought the problem was solved, and I bought a new 2TB M2 PCIe SSD from the same brand. I removed the 1TB SSD and replaced it with the 2TB SSD and then installed Ubuntu 19.10 (from USB): enter image description here

enter image description here enter image description here enter image description here enter image description here

However, when I restarted the computer I got "No bootable devices found.": enter image description here

By pressing F2 I entered the BIOS:

enter image description here

which shows that the disk is present as "M.2 PCIe SSD-0". I find it very strange that the 1TB SSD can boot fine, whereas the 2TB SSD will not boot.

Any ideas what can be the problem?

Håkon Hægland
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    You may have installed Ubuntu in the 2TB SSD in Legacy mode. See [this answer](https://askubuntu.com/questions/1134678/installation-problems-with-grub-can-only-install-by-reinstalling-windows-in-leg) to see some differences in pictures for the Live USB in UEFI and Legacy modes. – user68186 Mar 03 '20 at 21:36
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    @user68186 Thanks! This worked, fantastic!! When I press F12 at startup to enter boot mode selection screen, I previously chose the "Legacy external device boot" for the USB stick when installing Ubuntu, however I now chose "UEFI boot" instead and then reinstalled Ubuntu. When the installation finished, it booted fine into Ubuntu 19.10 – Håkon Hægland Mar 03 '20 at 22:10
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    Does this answer your question? [Installation problems with GRUB, can only install by reinstalling Windows in legacy mode but need to keep in UEFI mode](https://askubuntu.com/questions/1134678/installation-problems-with-grub-can-only-install-by-reinstalling-windows-in-leg) – user68186 Mar 03 '20 at 22:14
  • @user68186 I am not sure if it answers the question, since I did not have a dual boot with Windows. – Håkon Hægland Mar 03 '20 at 22:16
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    I am not sure either, the question is certainly different, but the answer is the same! ;-). I am hoping other reviewers will find a better question that already solves the same problem. Feel free to write your own answer. If no agrees that this is a duplicate, I will retract the close vote. – user68186 Mar 03 '20 at 22:19
  • @user68186 Thanks again! I posted an answer. – Håkon Hægland Mar 04 '20 at 08:11

1 Answers1

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From the boot device selection screen, you need to install Ubuntu from the USB using the "UEFI BOOT" option:

enter image description here

it will not work if you choose the "LEGACY EXTERNAL DEVICE BOOT" option:

enter image description here

Håkon Hægland
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