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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

cordic 45
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    The ESP is where your computer boots from. If you remove the drive containing it then nothing boots, obviously. – ChanganAuto Oct 11 '22 at 09:09
  • 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 – cordic 45 Oct 11 '22 at 09:16
  • 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. – ChanganAuto Oct 11 '22 at 09:26
  • I tried it before, windows can boot independently. Just need to change the boot order(set SSD2 to top priority). – cordic 45 Oct 11 '22 at 09:33
  • 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 – ChanganAuto Oct 11 '22 at 09:52
  • @ChanganAuto Thanks! After I try it, I will let you know. – cordic 45 Oct 11 '22 at 10:05
  • @ChanganAuto It work! thanks – cordic 45 Dec 08 '22 at 06:12

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