Ubuntu Live usb not able to boot

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I installed ubuntu 18.04 on a live usb drive under UEFI mode by using Virtualbox.
It works fine, I’m able to boot on virtualbox from the usb drive.
But when I tried to boot from the usb drive on my actual laptop, my laptop keep showing “system BootOrder not found, Initializing defaults” and then restart.
To solve this problem I followed the solution under this post Unable to install Ubuntu on Acer Aspire ES1-533 on virtual machine and tried to boot from usb again.
This time, the bios is showing “Invalid signature detected. Check secure Boot Policy in Setup”. And I’m not able to boot into ubuntu using virtualbox neither, the it just keep showing the grub prompt.
I’m using a MSI laptop. Inside BIOS I don’t have option to make custom boot or add secure key.
I’m going to reinstall the ubuntu onto the usb drive using virtualbox. What should I do to solve boot problem? Thank you.

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Marisa

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