The ubiquity installer does not work for me (mate-desktop/mate-desktop#278). Thus, I'm trying to install it manually.
In general, I follow the arch guide https://wiki.archlinux.org/index.php/installation_guide. But rather than pacstrap
one needs to use debootstrap
. See also: https://help.ubuntu.com/lts/installation-guide/powerpc/apds04.html
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Format the external ssd drive.
The partition table needs to be GPT to accommodate all, Linux, Mac and Windows.