wireless - How to debug failed wifi connection? - Ask Ubuntu

i using ubuntu 16.04 on asus zenbook ux305. have changed router huawey hg633 , unable connect wifi network. same router works fine through ethernet connection. same wifi connections work fine on other windows laptops , few mobile phones not on linux.

after running dmesg following message

[ 2879.219757] wlan0: authenticate 60:83:34:2d:d6:fc [ 2879.226060] wlan0: send auth 60:83:34:2d:d6:fc (try 1/3) [ 2879.226517] wlan0: authenticated [ 2879.230953] wlan0: associate 60:83:34:2d:d6:fc (try 1/3) [ 2879.232039] wlan0: rx assocresp 60:83:34:2d:d6:fc (capab=0x411 status=0 aid=3) [ 2879.234649] wlan0: associated [ 2879.234718] ipv6: addrconf(netdev_change): wlan0: link becomes ready [ 2879.240962] wlan0: disassociated 60:83:34:2d:d6:fc (reason: 14) [ 2904.309137] ipv6: addrconf(netdev_up): wlan0: link not ready 

i unable move forward , identify further steps debug problem. appreciated.

when read new router has been installed, nervous because often, routers put in place default settings work fine wireless devices may not work linux drivers sensitive settings in router or other access point.

please check settings in router. wpa2-aes preferred; not wpa , wpa2 mixed mode , not tkip. second, if router capable of n speeds, may have better connectivity channel width of 20 mhz in 2.4 ghz band instead of automatic 20/40 mhz, although affect n speeds. have better luck fixed channel, either 1, 6 or 11, rather automatic channel selection. also, router not set use n speeds only; auto b, g , n preferred. after making these changes, reboot router.

next, recommend regulatory domain set explicitly. check yours:

sudo iw reg 

if 00, one-size-maybe-fits-all setting. find yours here: http://en.wikipedia.org/wiki/iso_3166-1_alpha-2 set temporarily:

sudo iw reg set 

of course, substitute country code if not iceland. set permanently:

gksudo gedit /etc/default/crda 

use nano or kate or leafpad if don't have text editor gedit.

change last line read:

regdomain=is 

proofread carefully, save , close text editor.

next, i'd set ipv6 ignore in network manager: http://docs.fedoraproject.org/en-us/fedora/18/html/installation_guide/images/netconfig/network-connections-ipv6-ignore.png example ethernet, want wireless.

after making these changes, let hear if connectivity improved.