Wifi connect problem

Solution 1:

You can try to turn off the wireless power saving that tends to disconnect the card too soon:

sudo iw wlan0 set power_save off

Edit: Some more suggestions...

From the output you sent it could be that the ipv6 is failing to connect

Edit connections > chose your network then click edit > IPV6 tab > set method to "ignore"

I've seen other threads with people having trouble with certificates: Authentication in wireless network

  sudo nano /etc/NetworkManager/system-connections/YOUR-NETWORK-NAME

and comment out the line (put a # in front of) system-ca-cert=true

Could it be a firmware problem for your usb adaptor? You could try to connect via ethernet cable and do an update via software updater.

Last thing that comes to mind, just delete the current connection and start over...

Let us know how it went

Solution 2:

As I can see dhclient can't retrieve IP from router. At least IPv6. So try to set IPv6 to "ignore" and/or enable/disable using of IPv6/IPv4. All this didn't help me (I have same log). I set IPv4 manually. As first I set random IP and just connect to router. Here I have no Internet but I'm connected to router. Then I nmap'ed network to find router IP: nmap 192.168.0.0/23 And then set router IP as gateway.

This is not a solution for all situations but it helped me tonight to connect to hotel free wi-fi. Also I had to set DNS. I used google public dns but you can set any other.