Your system information

• Steam client version (build number or date): 1.0.0.64
• Distribution (e.g. Ubuntu): Devuan 3 (beowulf)
• Opted into Steam client beta?: No
• Have you checked for system updates?: Yes
• Eudev version: 3.2.7

Please describe your issue in as much detail as possible:

At boot, eudev complains about an invalid key/value pair:

udevd[425]: invalid key/value pair in file /lib/udev/rules.d/60-steam-input.rules on line 42, starting at character 82 ('u')

Offending line:

KERNEL=="input*", ATTRS{name}=="Lic Pro Controller", RUN{program}+="/bin/sh -c \"udevadm test-builtin uaccess /sys/%p/../../hidraw/hidraw*\""

It seems that eudev doesn't like escaped double quotes. I'm not sure whether to report it to the Eudev folks.