IIRC I read an anecdote a few years back that if MS ever lost the code to their office products they couldn't re-implement it 100% compatible again since they don't completely abide by any standards like the Open Document Format.
I will always continue to harbor hatred for MSs Office products since when I had to write a big piece of homework for 9th grade in school (a "Facharbeit", kinda like a mini Bachelor's thesis as an intro to scientific writing) I then had to transfer the file from my computer via USB drive to my fathers' PC to print it out. Naive as i was, I didn't think to double-check the formatting after the transfer since it was the same software on the same version on the same OS etc. Ended getting a "1 (very good)" for content but the formatting grade was so bad it dragged the combined mark down to a "3 (satisfactory)". Since then I'll only print documents after converting to pdf and double-checking everything is ok and will never voluntarily use an MS Office product ever again.
And also, can’t you just disable Secure Boot?
[1]: "On Ubuntu, all pre-built binaries intended to be loaded as part of the boot process, with the exception of the initrd image, are signed by Canonical's UEFI certificate, which itself is implicitly trusted by being embedded in the shim loader, itself signed by Microsoft.
On architectures or systems where pre-loaded signing certificates from Microsoft are not available or loaded in firmware, users may replace the existing signatures on shim or grub and load them as they wish, verifying against their own certificates imported in the system's firmware."
[1] https://wiki.ubuntu.com/UEFI/SecureBoot#How_UEFI_Secure_Boot...
I've not done it personally as most of my machines I just disable Secure Boot, but it's an option if you know about it and buy carefully.
I see what you mean now, I screwed up reading your first comment.
Even though Secure Boot can be disabled on most hardware afaict [0] that's still a step consumers won't take so the point still stands easily. Especially with the amount of "you will break everything and kick a a puppy" that manufacturers throw in there to disuade anyone who manages to get to the menu.
[0] worked at a repair ahop until 1.5ish weeks ago, have disabled SB on a lot of hardware.