Amendments to Ubuntu documentation (UEFI) suggested

[JKiBa]

Hi,

First, I need to thank you for this great project. It's the thing I was looking for for years to get my beloved ZFS running smoothly and not wondering at every system update or even kernel change that my Ubuntu/zfs root needs intensive GRUB2 boot repairs.

I'd like to suggest two amendments to the documentation as I stumbled on two different topics:

1.) Default kernel to boot:
At first boot I think it is advisable to select the "vmlinuz" boot entry instead of "vmlinuz-6.XX.XX" as Ubuntu always updates this symlink on kernel updates. This way "vmlinuz" always directs to the latest and "vmlinuz.old" to the second latest kernel.

--> My suggestion is to add advice to change the default kernel on first boot in zfsbootmenu

2.) Grub2
In your documentation you prevent grub2 from getting installed - great. But Ubuntu is extremely focused on installing it on many different occasions. So I ended up placing two files in /etc/apt/preferences.d/

/etc/apt/preferences.d/ubuntu_grub2_prevent

Package: grub2-common
Pin: release *
Pin-Priority: -1

/etc/apt/preferences.d/ubuntu_grub_prevent

Package: grub-common
Pin: release *
Pin-Priority: -1

This prevents installation of both packages effectively. Even if you try manually. Perhaps this could also be a hint in the documetation for other users.

Thanks again for your work!