Edit file File name : ModemManager.service Content :[Unit] Description=Modem Manager After=polkit.service Requires=polkit.service ConditionVirtualization=!container [Service] Type=dbus BusName=org.freedesktop.ModemManager1 ExecStart=/usr/sbin/ModemManager StandardError=null Restart=on-abort CapabilityBoundingSet=CAP_SYS_ADMIN CAP_NET_ADMIN ProtectSystem=true ProtectHome=true PrivateTmp=true RestrictAddressFamilies=AF_NETLINK AF_UNIX AF_QIPCRTR NoNewPrivileges=true User=root [Install] WantedBy=multi-user.target Alias=dbus-org.freedesktop.ModemManager1.service Save