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The ' grub-efi-amd64-signed' package failed to install into / target/. Without the GRUB boot loader, the installed system will not boot.

This is the error I get every time I try to install 18.04. I have formatted the MBR and C drive of Windows and currently I have only dev/sda to install. I don't want to lose other data which I had in Windows 10.

What should be the status of legacy mode and secure boot while installing Ubuntu 18.04?

I see only dev/sda instead of dev/sda2, dev/sda3.

What should I do?

marked as duplicate by karel, Thomas, Eric Carvalho, N0rbert, WinEunuuchs2Unix Oct 10 '18 at 4:16

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • Pick one from askubuntu.com/questions/789998/… askubuntu.com/questions/1056647/… askubuntu.com/questions/934415/… But I found at least 25 similar – Rinzwind Aug 23 '18 at 9:13
  • @PRATAP sorry, it's 18.04.1 – user227495 Aug 23 '18 at 9:15
  • "I don't want to loose other data which I had in Windows 10." And that's why you make a backup before messing with your system. – Rinzwind Aug 23 '18 at 9:15
  • Thanks @Rinzwind . My previous installation had a virus. Therefore, I thought it was not safe to move files before checking to another PC. My best bet is installing Ubuntu, reviewing files and then move them. How can I achieve " bootable USB should have a GPT ". I am not skilled. If you don't mind, can you please tell me what I should do in a sentence or two ? – user227495 Aug 23 '18 at 9:21
  • 2 sentences? Not really. But the 3 topics I posted in comments should be enough ;-) – Rinzwind Aug 23 '18 at 9:52
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The point is that you need to have EFI System Partition. So create one with 512MB. For detailed installation instructions check: Ubuntu 18.04 LTS Minimal Install Guide

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