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I have tried modifying the grub file manually and using Grub Customizer along with Rescatux,. Nothing is working. I get the error "Microsoft boot manger EFI not found". I even made a USB with win10, it would not boot the USB. I have change the BIOS several times. The win10 drive does not show up. Any help is appreciated. Thanks

RadioJockey
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  • You probably deleted Windows. In any case, in UEFI (still wrongly called "BIOS") check the Boot menu and where you see "Ubuntu" try selecting "Windows bootloader manager" instead, save and reboot. That should boot Windows directly, if its system partition wasn't overwritten, of course. – ChanganAuto Feb 06 '22 at 19:55
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    Ubuntu typically only installs grub2's boot loader into first drive's ESP. If you want to boot external drive from other systems, you need boot loader on external drive. And then you need an ESP - efi system partition on external to be able to install boot loader on that drive. Old bug but never fixed. Several work arounds. https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1396379 & https://askubuntu.com/questions/16988/how-do-i-install-ubuntu-to-a-usb-key-without-using-startup-disk-creator – oldfred Feb 06 '22 at 21:23
  • in the BIOS ,windows is not shown nor in the grub! I don't think I deleted windows when I installed in Ubuntu on a separate external drive. You might example if you have time. – RadioJockey Feb 06 '22 at 22:00

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drop to a command line and enter:

sudo update-grub

If grub sees your windows installation it will automatically configure it for you.

Derrick Kvothe
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  • I have tried that also. I first did fdisk -l and it shows the WDC drive disk label gpt. Still did not find the windows 10. Thanks I'm not sure what to do next. I need to get the windows working again because all my files are there. Thanks – RadioJockey Feb 06 '22 at 22:44
  • all my files are there -- You can still access them from Ubuntu. You can use Windows installation media to restore the Windows bootloader (search for it in Google/Duckduckgo). – Archisman Panigrahi Feb 07 '22 at 04:13
  • Based on the info in the question asked how is this an answer? – David Feb 07 '22 at 07:07