I had an issue when I installed Ubuntu Mate on my Acer 575G. Laptop seem to be stuck in a boot loop. Every time I power on the laptop, it gave me an error message for about a second saying "no bootloader found" and then restarted. So, I had to press down the power button to get out of the loop.

After that I found a solution from "it's foss" to fix this very issue. In his article he guessed that the secure boot could be the cause behind this problem. But I had already disabled it. However, I was managed to fix this issue by following these steps.

Step 1

  • Turn the power off.
  • Power on the laptop while pressing F2 key quickly. (Your BIOS key)
  • Get into BIOS settings.

Step 2

  • Enable secure boot if it's disabled. It's under the boot tab.
  • Step 3

  • Go to security tab.
  • Choose "Select an UEFI file as trusted for executing" option.

Step 4

  • Select the HDD you installed UBUNTU or your distro.

Step 5

  • Choose <EFI> option.

Step 6

  • Select <Ubuntu> option.

Step 7

  • You will see shimx64.efi, grubx64.efi and MokManager.efi.
  • Important one is shimx64.efi. Select it and press enter.

Step 8

  • In next screen type "Yes" or the description you want & select Yes option.

Step 9

  • Save your BIOS settings and exit.

Source : https://itsfoss.com/no-bootable-device-found-ubuntu/

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