I installed the latest Manjaro in a VM (lovely installer BTW--Cinnamon looks fantastic!) and did a full update, but I'm only getting Sigil 1.2.1 from the repos at the moment. My mirrorlist must not have updated yet. 1.2.1 seems to install and run as is should when installing it with pacman, though. Not sure what might be wrong on your system. The one error clearly indicates a space issue, but if that's not the case, I'm at a loss as to how to help.
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