Installed Ubuntu 18.04 on Dell XPS15; "No bootable device found"

I have a Dell XPS15 9570 laptop that came with Windows 10 preinstalled. I decided to remove Windows 10 completely and install Ubuntu 18.04.

I burnt the .iso on my USB drive. I had to change BIOS settings to make the laptop boot from it:

1. Secure Boot > Secure Boot Enable > uncheck the Secure Boot Enable checkbox
2. General > Boot Sequence > select Legacy External Devices
3. Only leave USB Storage Device checkbox checked.

After those changes, the Ubuntu 18.04 installer showed up. I erased the whole disk and installed Ubuntu 18.04 on it, however upon restart I see the error message No bootable device found.

I reinstalled Ubuntu (prior to that I saw that the Ubuntu installer recognized that there's already a copy of Ubuntu installed) with two partitions, but the problems still persist.

I ran Boot-Repair, and it showed an error and this link. The error is:

grub-probe: error: cannot find a GRUB drive for /dev/sda1. Check your device.map.
The boot files of [Ubuntu 18.04.1 LTS] are far from the start of the disk.
Your BIOS may not detect them.
You may want to retry after creating a /boot partition (EXT4, >200MB, start of the disk).
This can be performed via tools such as GParted.
Then select this partition via the [Separate /boot partition:] option of Boot-Repair. ()

4 Sorted by: Reset to default

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