Manjaro onto Chromebook
I downloaded manjaro-xfce-20.2.1-minimal-210103-linux59.iso and put it on a USB stick using Mint stick which is in AUR.
I then booted this on the Chromebook and the install worked until installing bootloader failed.
The solution is to open a terminal and enter
manjaro-chroot -a
Then retype the failed command and add
--no-nvram --removable
This works without error.
Then type
update-grub
and exit.
The system works very well and it is quicker than with KDE on, I tested that first.