I helped installing Ubuntu 18.04 in an Acer Aspire One cloud 14. Then I noticed the No booting device error I followed these instructions that recommended '“Select an UEFI file as trusted for executing”' and then I got a purple screen after reboot.

Picking the right order for the newly fixed boot (I left 'yes' in the description as in the image in the link) didn't work immediately, I had to disable secure boot to obtain the GRUB screen and form there picking *Ubuntu -the first option- didn't work. Most answers recommend to disable secure boot and apparently that fixed the error in the past.

In my case, I only can load Ubuntu if I pick the recovery option, pick recovery mode, 'update grub loader' and then resume the load of Ubuntu and login. I don't know how to fix since most old answers (for 16.04 or older) end with the solution given above, but how can I fix grub permanently?

  • If you can boot Ubuntu why didn't you run sudo update-grub yet? If it runs without errors you need to check the boot options at the UEFI. – user880592 Mar 21 '19 at 18:11

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