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I used to get connected to the internet without any issues earlier using my router(DLINK DSL-2730U) . I tried to configure new router(TP-LINK TL-WR841N) by running following command: 

sudo ppoeconf wlan0

After that my network manager is not able to detect any Wifi networks. Network Connections However the networks are available when I scan using "Wifi Radar". But I am not able to connect through that either.

If i run : $ iwlist wlan0 scan

it gives - wlan0 No scan results

If i run : $ sudo iwlist wlan0 scan gives - list of all available wifi connections

I ran this test (My wireless/WiFi connection does not work. What information is needed to diagnose the issue?) and here is my result http://paste.ubuntu.com/14309114/

Can somebody please help me.

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4 Answers 4

Reset to default
10

Yesterday, I upgraded from Ubuntu 16.10 to Ubuntu 17.04 and my wifi stopped working.

I noticed that I could still set up wifi manually on the console but the network manager applet wouldn't show any wifi spots and also not the active connection.

After spending 3 hours on the problem, I could fix it by a very simple step, namely modifying /etc/network/interfaces by removing (or commenting out using #) the following two lines:

auto wlan0
iface wlan0 inet dhcp

I hope this might be useful for others!

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  • Thank you so much! You just saved me a lot of trouble...already spent 2h on that :)
    – tkazik
    Jan 25, 2022 at 9:46
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SOLVED

Go to

sudo nano /etc/network/interfaces

and deleted this line (Apparently, the above line is used to disable wifi network!)

iface wlan0 inet manual

and then restart network manager using

sudo service network-manager restart
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  • Thanks, man saving my time
    – Harish Verma
    Jun 24, 2020 at 17:51
1

Run this command and hopefully it will reset your connection. sudo service network-manager force-reload

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  • No this does not help. I think the issue is ifconfig is returning wlan0 and wlan0: avahi (refer paste.ubuntu.com/14309114). I think issue will be resolved if I can remove "wlan0:avahi"
    – Sri-Newbie
    Dec 31, 2015 at 13:32
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looks like the distro may have difficulty connecting to mixed router 2.4 G signals. Set your router to non 1.n (1.b) to connect to wifi

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