[Assist] Pacman "failed to prepare transaction"

[Kete Foy]

Hello, when trying to 'pacman -Syu', I get the following:
error: failed to prepare transaction (could not satisfy dependencies)
:: systemd: requires libsystemd=255

Attached is my mirror list.
-- 
–Kete
https://emailselfdefense.fsf.org/en/
https://www.fsf.org/windows
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# Parabola GNU/Linux-libre - Last Updated: Wed Aug  5 20:20:20 BST 2015

# Location: Bucharest, Romania
# Responsible: 4096R/8E9AC62779085582 Daniel Petre <daniel.petre at rcs-rds.ro>
# Company: RCS&RDS - http://www.rcs-rds.ro/
# Work hours: 24*7
Server = http://parabolagnulinux.mirrors.linux.ro/$repo/os/$arch

# Location: Flevoland, Netherlands
# Responsible: 4096R/5DF2EFEEE6C7793E Gaming4JC <gaming4jc2 at yahoo.com>
# Work hours: 24*7
# HTTPS cert SHA1 E5:C7:F0:59:F2:3F:E6:CB:BE:FE:8C:D5:A9:BD:AA:4B:AB:06:36:CD
Server = https://parabola.goodgnus.com.ar/$repo/os/$arch

# Location: St Petersburg, Russia Federation
# Responsible: 4096R/953311F67B9EAA23 Michael Wolf <m at mw.gg>
# Work hours: 24*7
# HTTPS cert SHA1 FF:86:EB:70:14:41:6A:FA:D1:2C:3B:A7:51:FA:0D:71:60:BC:9B:DE
Server = https://dgix.ru/mirrors/parabola/$repo/os/$arch

# Location: Moscow, Russian Federation
# Responsible: Yandex <opensource at yandex-team.ru>
# Work hours: 24*7
Server = http://mirror.yandex.ru/mirrors/parabola/$repo/os/$arch

# Location: Charlotte, NC, USA
# Responsible: 2048R/44BC7D7F49B9A5A4 alfplayer <alfplayer at mailoo.org>
# Work hours: 24*7
Server = http://alfplayer.com/parabola/$repo/os/$arch

# Location: Guadalajara, Mexico
# Responsible: 4096R/33466E12EC7BA943 Isaac David <isacdaavid at isacdaavid.info>
# Work hours: 24*7
Server = http://parabola.isacdaavid.info:8081/$repo/os/$arch

# Location: London, UK
# Responsible: Parabola Project
Server = http://repo.parabola.nu/$repo/os/$arch

# Location: Milan, Italy
# Responsible: 4096R/177A2DB9EA08BF5D Andrey Korobkov <korobkov at fryxell.info>
# Work hours: 24*7
# HTTPS cert SHA1 24:F2:51:EB:3C:93:AF:FC:87:6C:42:F2:85:51:9E:11:70:3C:3E:8D
# Sync source: 15,45 * * * * (UTC) via rsync://mirrors.linux.ro/parabolagnulinux/
Server = https://b.mirrors.fryxell.info/parabolagnulinux/$repo/os/$arch
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