Even if you do not see Grub screen, you should at least not be seeing “no bootable device found” screen anymore. Reboot your system and this time you should be seeing the familiar Grub screen. Once we have added it as trused EFI file to be executed, press F10 to save and exit. In next screen, type Yes and click enter. You’ll see shim圆4.efi, grub圆4.efi and MokManager.efi file here. Don’t get impatient, you are almost there :) Step 7 If you have more than one hard disk, I hope you remember where did you install Ubuntu. You should see your hard disk like HDD0 etc here. You must remember or keep this password safe because if you forget it, you won’t be able to make changes to your BIOS setting ever. On Acer devices, you have to set a supervisor password first before it shows the option to select a UEFI file or disable secure boot.
Adding it as trusted, kind of whitelisting, will let the device boot from the Ubuntu UEFI file. If you remember, UEFI boot’s main aim is to provide security and since Secure Boot was not disabled (perhaps) the device did not intend to boot from the newly installed OS. Just for your information, what we are going to do here is to add the UEFI settings file (it was generated while Ubuntu installation) among the trusted UEFI boots in your device. Go to Security tab and look for “Select an UEFI file as trusted for executing” and click enter. In the boot settings, make sure that Secure Boot is turned on. Depending upon your manufacturer/model, you might need to use Del or F10 or F12 keys. You have to be very quick with it if you are using SSD hard disk because SSDs are very fast in booting. I had to press Fn+F2 (to press F2 key) on Acer Aspire R13 quickly. Turn the power off and boot into boot settings. My OnePlus camera seems to be not very happy with my laptop screen. Fix no bootable device found error after installing Ubuntu If you are in similar situation, you can try the fix which worked for me.
In my opinion, not disabling the secure boot was the reason of this error. After installing Ubuntu, I saw no bootable device found error while booting from the hard disk.existing Windows, various partitions etc. I chose to install Ubuntu by erasing everything i.e.You can read this post to know how to disable secure boot in Acer laptops Secure boot was not turned off (my laptop has just come from repair and the service guy had put the secure boot on again, I did not know until I ran up in the problem).My Acer Aspire R13 came preinstalled with Windows and with UEFI boot manager.
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