I was facing some issues with wifi disconnection. So I followed some askubuntu forum answers and solved the problem by manually installing the wifi device. But still I had to follow the first answer of this question (How do I get an RT3290 wireless card to work?) to make it work on every start up.

Then suddenly it stopped working now. Now when I run sudo lshw -C network it gives me this error.

*-network UNCLAIMED     
       description: Network controller
       product: RT3290 Wireless 802.11n 1T/1R PCIe
       vendor: Ralink corp.
       physical id: 0
       bus info: pci@0000:08:00.0
       version: 00
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list
       configuration: latency=0
       resources: memory:b5510000-b551ffff
       description: Ethernet interface
       product: RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:09:00.0
       logical name: eno1
       version: 08
       serial: a0:1d:48:d1:23:d9
       size: 100Mbit/s
       capacity: 100Mbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full firmware=rtl8106e-2_0.0.1 04/23/13 ip= latency=0 link=yes multicast=yes port=MII speed=100Mbit/s
       resources: irq:42 ioport:4000(size=256) memory:b5404000-b5404fff memory:b5400000-b5403fff

it says network UNCLAIMED. Why is that ? How can I solve that issue ?

When I run lspci it shows me my wifi adapter model as

08:00.0 Network controller: Ralink corp. RT3290 Wireless 802.11n 1T/1R PCIe

I followed this. But it says that it will work when secure boot is disabled. But the thing is I've already disabled secure boot and I was working fine about two hours ago.

How can I solve this? Any help would be much appreciated.

  • try using a USB WiFi adapter and then if that works replace the wireless card in your pc or laptop. I have a HP that had a bad Intel card and that was not compatible and I replaced the card and now it works. – Guy Byrd Jan 15 '18 at 16:05
  • But it was working few hours ago. The only thing I did is turning off my laptop and turning back on after few hours – Thidasa Pankaja Jan 15 '18 at 16:06
  • So the problem persists after reboot? UNCLAIMED is not the same as in the link you posted DISABLED. I think UNCLAIMED in this context means you have a driver, but it has not claimed the device. Probably you can manually bind the device to the module / driver. lspci -knn should give you the driver name. Than use that in tree /sys/ | grep module_name. This should give u the path to the driver. Than as root echo "0000:08:00.0" > /sys/path/to/driver/bind. – AlexOnLinux Jan 15 '18 at 17:52
  • @AlexOnLinux When I run the command tree /sys/ | grep module_name with my module name this returns nothing. – Thidasa Pankaja Jan 16 '18 at 0:35
  • @Pankaja Paranavitharana could you please Edit your question and add the output of lspci -knn – AlexOnLinux Jan 16 '18 at 6:32

I had exactly the same problem today. Turned off my laptop after finishing with my job and than turning it back on when I got home. Ubuntu wasn't able to find any wi-fi. I know that this might sound stupid, but try turning off (not restarting) your pc, leave it for a few seconds or a minute and then turn it back on. This, no matter how stupid it sounds, just solved my problem and I'm able to use wifi again (I also ran sudo apt-get update and sudo apt-get upgrade, which I don't think helped solving this issue, but updating can't be bad). Just for the record, I was also restarting my laptop few times but it didn't helped.

Hope this helps you.

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