@jokker: You can boot 64-bit Ubuntu on the Switch 10 (or any other Bay
Trail Atom device) using 32-bit GRUB. You will need to compile GRUB
yourself. The easiest way to accomplish this is to copy the 32-bit UEFI
bootloader from a GParted LiveCD to your Ubuntu LiveUSB media, turn off
Secure Boot on your tablet, and boot Ubuntu. From there you can download
the source for GRUB and compile it for 32-bit.

You can also leave Secure Boot off and just install Ubuntu using the
GRUB from GParted, but I don't recommend this - Secure Boot is an
important feature of your computer that aids in preventing malicious
code from executing pre-boot (e.g. during initial POST operations). If
you compile GRUB for Ubuntu specifically it will use a signed bootloader
that Secure Boot recognizes as trusted.

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https://bugs.launchpad.net/bugs/1341944

Title:
  32-Bit UEFI bootloader support needed

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