According to below quoted post (2nd post of this thread) I shouldn't use "pacman -Syu" on my Pogoplug Pro which is oxnas device.
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On the oxnas devices (Pro/Video/V3) don't run Pacman -Syu. It will try and update the system to a state that isn't compatible. You can update individual programs (samba etc) with Pacman -Sy samba and it will update that particular system to the current version. However, unless something is broken, then I recommend not updating. Often updating breaks something that you will have to troubleshoot.
Tom