自動設定エラー：g_multi：/sys/class/net/usb0/を待っています

私のDebian Linuxシステムに新しいsystemdログメッセージが表示されます。次のように：

Nov 30 20:41:42 beaglebone sh[628]: autoconfigure_usb0.sh: g_multi: waiting for /sys/class/net/usb0/

このメッセージは数秒ごとに繰り返されますが、原因が何であるかわかりません。オンラインでこのメッセージに関する情報が見つかりません。一部のサービスはすでにスクリプトを実行しているようですが、autoconfigure_usb0.sh明らかに動作しません。これはネットワークインタフェースに関連しています。現在、インターネット接続が可能なWi-Fiに接続されています。スクリプトautoconfigure_usb0.shは次のとおりです。

debian@beaglebone:~$ cat /usr/bin/autoconfigure_usb0.sh
#!/bin/bash
#
# Copyright (c) 2017 David Lechner <[email protected]>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#

if [ -f /etc/default/bb-boot ] ; then
        . /etc/default/bb-boot
fi

#Backup...
if [ "x${USB_CONFIGURATION}" = "x" ] ; then
        USB0_ADDRESS=192.168.7.2
        USB0_NETMASK=255.255.255.252
fi

#
# Auto-configuring the usb1 network interface:
#
# usb1 is the CDC/ECM gadget connection. It is managed by ConnMan and uses
# tethering so that it serves a DHCP address to attached hosts. The IPv4 subnet
# used by ConnMan is not consistent, so hosts should connect using the mDNS
# name (beaglebone.local) instead of an IP address.
#

until [ -d /sys/class/net/usb0/ ] ; do
        sleep 1
        echo "autoconfigure_usb0.sh: g_multi: waiting for /sys/class/net/usb0/"
done

# gadget is not supported by ConnMan provisioning files, so we have to do this
# the ugly way. Advanced users can comment these line to gain full control of
# the usb1 network interface.
#connmanctl enable gadget >/dev/null 2>&1
#connmanctl tether gadget on >/dev/null 2>&1

# if there is any pre-existing config for usb1, use that;
# otherwise use a static default
grep -rqE '^\s*iface usb0 inet' /etc/network/interfaces* && /sbin/ifup usb0 \
        || /sbin/ifconfig usb0 ${USB0_ADDRESS} netmask ${USB0_NETMASK} \
        || true

この分野でより多くの経験を持つ人がここで何が起こっているのかを理解するのに役立つことを願っています。ありがとうございます！

編集する：次のコマンドの出力は次のとおりです。

debian@beaglebone:~$ ls /sys/class/net
can0  can1  lo  SoftAp0  wlan0