I just got a Dell Inspiron 7580 with Windows 10 pre-installed. I wanted to install Ubuntu so I followed the usual instructions:
- Disabled Secure Boot
- Disabled Fast Startup
Then I tried to install from a USB stick but the installer could see no disks at all. I then changed from RAID to AHCI. The installation was completed successfully and everything seemed to work fine.
After the installation I wanted to check the pre-existing Windows 10 installation and selected Windows Boot Manager, only to see the infamous INACCESSIBLE_BOOT_DEVICE screen.
Everything is OK in the Ubuntu installation.
A pre-installed recovery tool from Dell reinstalled Windows 10 but still the INACCESSIBLE_BOOT_DEVICE message appears.