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I've recently installed Arch and had some issues with Wired/Wireless, eventually got this fixed, but have a rogue device trying to load on boot:

A start job is running for sys-subsystem-net-devices-wlp0s20u3.device, counts up thru 90 secs, then fails.

This was created when I plugged in a WiFi dongle to get connectivity whilst installing/configuring, it is no longer in use. I've tried:

systemctl disable sys-subsystem-net-devices-wlp0s20u3.device
Failed to disable unit: Unit file sys-subsystem-net-devices-wlp0s20u3.device does not exist.

netctl disable sys-subsystem-net-devices-wlp0s20u3
No regular unit file found for profile 'sys-subsystem-net-devices-wlp0s20u3'

.

systemctl reset-failed results in no output, and changes nothing. If I list similar units:

systemctl list-units --all | grep subsystem
sys-subsystem-net-devices-eno1.device      loaded    active   plugged   Ethernet Connection I217-V                                                 
sys-subsystem-net-devices-wlp0s20u3.device loaded    inactive dead      sys-subsystem-net-devices-wlp0s20u3.device 

How can I get rid of this from attempting to load

2

This problem appeared in my case, when I set up the netctl-auto@*interface*.service in a wrong way. Try to remove the faulty sevice manually by removing the regarding file in
/etc/systemd/system/multi-user.target.wants/.

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