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My wifi was working fine until yesterday but today it just won't work. I have included the wireless-info.txt at https://paste.ubuntu.com/23711855/.

It seems iwlwifi is causing issues.

Edit:- As Suggested, I reset the BIOS settings and it seemed to work for a few hours. Then later the problem returned.

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migrated from askubuntu.com Dec 31 '16 at 21:08

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Try checking that wifi isn't disabled in the BIOS. – mikewhatever Dec 30 '16 at 16:21
    
I reset the BIOS settings and wifi seemed to work but I am again facing the same issue. – Raju Dec 31 '16 at 10:12
    
If the wireless adapter showed up after resetting the BIOS and then vanished again this is very likely a hardware and or firmware issue unrelated to Ubuntu. It's not that Ubuntu doesn't know what to do with the wireless chipset; it's that Ubuntu isn't even aware of its existence according to your network diagnostics – which can only mean the computer firmware doesn't announce its presence for some reason. You should request for your question to be migrated to Super User by a moderate via the "flag" link below it. On Super User such problems are on topic. – David Foerster Dec 31 '16 at 13:21

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