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readme: note grub2 differences on non-alpine platforms
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In the Remastering ISO section of the README.md note that it is not
uncommon for `grub-mkrescue` from grub2 installations to create `boot/grub2`
instead of the expected `boot/grub`.

Addresses #288 (and possibly #358)
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@dweomer
dweomer committed Jan 28, 2020
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Expand Up @@ -154,6 +154,11 @@ cp /mnt/boot/grub/grub.cfg iso/boot/grub/
grub-mkrescue -o k3os-new.iso iso/ -- -volid K3OS
```

GRUB2 CAVEAT: Some non-Alpine installations of grub2 will create `${ISO}/boot/grub2` instead of `${ISO}/boot/grub`
which will generally lead to broken installation media. Be mindful of this and modify the above commands
(that work with this path) accordingly. *Systems that exhibit this behavior typically have `grub2-mkrescue`
on the path instead of `grub-mkrescue`.*

### Takeover Installation

A special mode of installation is designed to install to a current running Linux system. This only works on ARM64 and x86_64. Download [install.sh](https://raw.githubusercontent.com/rancher/k3os/master/install.sh)
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