Hello,

I had to do this in able to update from a fresh install (Linux parabolaiso 4.13.11-gnu-1 #1 SMP PREEMPT Fri Nov 3 21:09:48 CET 2017 x86_64 GNU/Linux), and the computer boots and reboots correctly. I don't dare to say exactly which file I used for the iso, but it could be this: parabola-systemd-cli-dual-complete-2017.10.17-21.39-alpha.iso. If you let me know how I can check that, I can report it correctly).:

pacman -Rnucs libxfont ring-lrc

This uninstalls a series of packages. Then, one can do

pacman -Syu