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dual boot with windows- ubuntu cannot run without windows

mg flag

I have two SSD.

 1. Micron Crucial MX500 250G      (install Ubuntu20.04)
 2. Intel  670P 512G SSD PCIe NVMe (install windows10)

Sometimes I need to carry my ubuntu (SSD1) to switch between different computers. However, my ubuntu cannot run without windows. Is there any way to fix it except recomputer?

Last year I was a rookie with no experience with linux system. Below are my installation steps.

1. Install windwos on SSD 2
2. After installing ubuntu on another computer mount the SSD 1 to my computer

But at the time I didn't know I needed to disable secure boot result in ubuntu wouldn't boot properly.

Finally, I install ubuntu on my computer and choose

**install ubuntu along with windows boot manager**

Windows Disk Management pic

EFI Folder pic

ChanganAuto avatar
us flag
The ESP is where your computer boots from. If you remove the drive containing it then nothing boots, obviously.
cordic 45 avatar
mg flag
Sorry for not clarifying my question. But the efi is on the SSD1 which is the SSD I install ubuntu. I try to this method but I failed https://askubuntu.com/questions/1250199/move-bootloader-or-remove-efi-partition-in-second-drive
ChanganAuto avatar
us flag
You actually have 2... You may, in the absence of Disk1, to open UEFI settings > Boot and try to select "Windows". It may or may not work.
cordic 45 avatar
mg flag
I tried it before, windows can boot independently. Just need to change the boot order(set SSD2 to top priority).
ChanganAuto avatar
us flag
You need to install Grub in the other ESP as well. You can try removing or simply disabling "Disk2" and then use Boot Repair from a live session: https://help.ubuntu.com/community/Boot-Repair#A2nd_option_:_install_Boot-Repair_in_Ubuntu
cordic 45 avatar
mg flag
@ChanganAuto Thanks! After I try it, I will let you know.
cordic 45 avatar
mg flag
@ChanganAuto It work! thanks
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