Hello I couldn't install the system, because I couldn't resolve some dependencies 
The following package cannot be upgraded due to unresolvable dependencies:
      btrfs-progs
Yes, it's pretty crappy that Arch decided to add 'systemd-libs' as dependency now, for no good reason that I can tell.

As a workaround, you can try:
# pacman -Sy btrfs-progs --assume-installed=systemd-libs
and that should allow you to update gvfs afterwards.

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