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How to prevent going to grub rescue screen on a dual boot machine where I also installed a fresh Ubuntu 20.04 image on an external SSD?

cn flag
jar

I had a dual boot setup working great for me. Ubuntu and Windows side by side, and on boot the grub screen would show up in case I wanted to boot to Windows - by default Ubuntu was on top.

Yesterday I got a new external NVME SSD and installed Ubuntu 20.04 on it via a USB stick from my internal Ubuntu OS. Everything seemed great. I could boot into any of the 3 OSes as long as my external SSD was connected.

When I disconnected my external SSD, then unfortunately I was greeted with a grub rescue screen. I didn't understand what it meant, so I just typed exit and it booted into Windows. Without connecting the external SSD I can't seem to boot into my original Ubuntu that's on the internal HDD.

How do I repair my grub that it shows the default Ubuntu and Windows when the external SSD is not connected and shows all 3 of them when the external SSD is connected?

oldfred avatar
cn flag
You need an ESP on both NVMe drive and external drive. And drives should be gpt partitioned. If you have or create ESP on those drives, you can re-install grub and set whichever drive you want as default first in UEFI boot order as long as all installs are UEFI. Lets see details, use ppa version with your live installer (2nd option) or any working install, not Boot-Repair ISO: Please copy & paste the pastebin link to the Boot-info summary report ( do not post report), do not run the auto fix till reviewed. https://help.ubuntu.com/community/Boot-Repair
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