There is no support officially for doing this. You need to boot to the UEFI and change the Secure Boot configuration to NONE.
How to install Ubuntu on Microsoft Surface Laptop (1-st gen)
Anonymous
Hello, I need to install Ubuntu on my Microsoft Surface Laptop 1-st gen. Can you help me?
I don’t know, where on this Laptop old bios, all time I open UEFI
Surface | Surface Laptop | Install and update
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