我的 ubuntu mate 版本是 16.04。无线适配器：Ralink RT5390
有一天，Wifi 突然停止工作，网络面板显示“设备未就绪”。我尝试了网上提供的解决方案，但都不起作用。相反，网络面板上的 wifi 行消失了。
输出lshw -class network：
WARNING: you should run this program as super-user.
*-network
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:07:00.0
logical name: eno1
version: 06
serial: 10:1f:74:0a:39:f2
size: 10Mbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl8168e-3_0.0.4 03/27/12 latency=0 link=no multicast=yes port=MII speed=10Mbit/s
resources: irq:34 ioport:4000(size=256) memory:c0404000-c0404fff memory:c0400000-c0403fff
*-network UNCLAIMED
description: Network controller
product: RT5390 [802.11 b/g/n 1T1R G-band PCI Express Single Chip]
vendor: Ralink corp.
physical id: 0
bus info: pci@0000:0d:00.0
version: 00
width: 32 bits
clock: 33MHz
capabilities: bus_master cap_list
configuration: latency=0
resources: memory:c4500000-c450ffff
*-network
description: Ethernet interface
physical id: 2
logical name: enp25s0u1
serial: ca:3c:02:e3:3a:7b
capabilities: ethernet physical
configuration: broadcast=yes driver=rndis_host driverversion=22-Aug-2005 firmware=RNDIS device ip=192.168.42.136 link=yes multicast=yes
WARNING: output may be incomplete or inaccurate, you should run this program as super-user.