See Steam failing to launch since systemd 253.5-2 update also github issue. After updating the system steam stops working with a core dump error of “Assertion 'device' failed at src/libsystemd/sd-device/device-private.c:103, function device_get_tags_generation(). Aborting.
”.
For me doing a sudo pacman -S lib32-libnm
fixed the issue.
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