Please follow https://wiki.switchroot.org/en/Linux/USB-or-eMMC-Boot instead.
I had trouble setting up Ubuntu on my Nintendo Switch because I borked the screen. That means no automatic partitioning and install using Hekate.
Thanks to theofficialgman/gman#3709 from Switchroot Discord for the advice https://discord.com/channels/521977609182117891/588138053735022632/1019272797169668226