EndeavorOS installed on external SSD won't boot

Hi everyone,

I have used an external SSD (Samsung T5 500GB) to install EOS.
For the installation I used a Dell Laptop (precision 3500), and now I want to boot EOS from my main machine, but once I get into the boot menu, the only options I have are:

  1. Windows Boot Manager(Main SSD)

  2. Windows Boot Manager(External SSD)

  3. Bios Settings

I am not sure why this is happening (when I boot EOS from the external SSD, using the laptop everything works fine).

My main machine build is:

  • Ryzen 9 9700
  • NVIDIA 4090
  • Gigabyte B650 Aorus Elite AX

If that matters, there is a virtualization option in bios, which I have already activated.


is smart boot turned off on your main machine?

That might be difficult, if not impossible, due to different hardware on two different machines? Especially your Bios (Legacy or UEFI), different GPUs, etc. …

1 Like

Have you installed with UEFI support?

In that case, you have to be careful and do some Tweeks before and after the installation process: https://www.lorenzobettini.it/2021/11/how-to-install-linux-on-a-usb-with-uefi-support/

1 Like

Thanks for the replies guys. I didn’t actually had time to review today, but I will check tomorrow and give an update.

This isn’t that difficult. I have in the past had a Linux on an external drive that I swapped between a couple of computers. However there are a couple of things you point out that are things the OP will have to address and that is legacy/efi boot and gpu. If he is already efi boot and non of the video cards are Nvidia it should be fairly simple.

1 Like

Is your external SSD bootable from the machine that it was originally created on?

Plug in the SSD into your Dell machine and post the output of:

sudo parted -l 

Apart from the driver for Nvidia card, there are also different microcodes involved for Intel resp. AMD machines.

1 Like

@thefrog I can’t find any option for ‘Smart Boot’ into my main machine.

When I go to Secure Boot I have these options:


My idea was to try to do a clean re-install from the USB with the ISO installer while using my main machine ( I don’t really know if that would make any difference !? ).
I am getting the following error while trying to boot from the USB:

This is the output.

I actually meant secure its been so long since I have had to change it just didnt remember the actual name lol however secure boot does need to be disabled

Secure boot needs to be disabled.

Secure boot needs to be disabled.




I disable secure boot, but didn’t really had any impact.

What I did was to rebuild the installation device (USB) using Rufus on Windows, then I used my main machine to install EOS in the external SSD (clean install) and now everything works like a charm.

I am pretty sure that the SSD won’t work on my laptop, but for now it’s something I can live with :smiley:

Thanks for all the advice guys.

1 Like