My version of ubuntu mate is 16.04. Wireless adaptor : Ralink RT5390
The Wifi suddenly stopped working one fine day and the network panel would say "device not ready". I tried solutions given online, but nothing worked for me. Instead the wifi row from network panel is gone.
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.