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I originally had Ubuntu 18.04 installed on my dell xps 13 (2017). A couple days ago, I replaced it with Ubuntu 20.04 due to constant error messages. Until today, I was able to use it without any trouble. However, I had to use Windows earlier today, and now when I was trying to boot Ubuntu back, I am unable to do so.

First error message

Unexpected return from initial read: Volume Corrupt buffersize 1000 Failed to load image \EFI\ubuntu\grubefi: Volume Corrupt start_image() returned Volume Corrupt

and then windows booted automatically.

In trying to resolve the issue,

  1. Tried reinstalling Ubuntu 20.04 using LiveUSB, but got the error saying the system doesn't have EFI System Partition
  2. Consulted the forum https://ubuntu.forumming.com/question/5394/unexpected-return-from-initial-read-volume-corrupt. In running Boot Repair, I received an error message, sayin EFI System Partition is needed.
  3. Used GPart to try to tweak disk settings (changing the disk partition that holds Ubuntu File System from ext4 to fat32... I didn't document this process very well)
  4. Followed a tutorial that used Windows command prompt and diskpart, creating an ESP.
  5. Reran Boot Repair (successfully this time)

However, now I encountered a GRUB error

"Minimal BASH like line editing is supported. For the first word, TAB lists possible command completions. anywhere else TAB lists possible device or file completions."

I've been looking up different solutions, but I am having trouble understanding them, and afraid I am messing my disk more and more.

Thank you in advance.

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