I'm having this same issue after installing Zorin OS on my Acer Aspire laptop to replace Win 10 . I've tried using a USB prepared with Ventoy, following other comments that Balena Etcher wasn't reliable any more, I've tried using boot repair tools but they seem to be running into "NVram locked" and are telling me they can't fix the problem when I set them to it. The boot repair utilities can see the presence of the Zorin, as Ubuntu, on the drive but I think the booting stuff lives on a smaller partition that the installer created and somehow that's not seeing the new OS at all, so "no bootable drive" error appears. I can still run the OS from the usb but really want to find a solution to this problem and start enjoying what looks like a good OS and a faster, rejuvenated, laptop. Any advice appreciated! Thank you.
@Chris710 ACER BIOS are often special.
In your BIOS you must set a supervisor password in tab security. Once the supervisor password is set, some new menus are accessible.
Enter the "Select an UEFI file as trusted for executing" menu. It will allow you to declare the newly installed Ubuntu (=Zorin) boot image as trusted.
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Thank you, I'll try that over the weekend and report back on how it works out..
Thank you for your suggestions, I went through the steps listed in the (very clear ) It's Foss link and it worked! I appreciate your taking the trouble to post that. Best wishes.
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