2

After upgrading to 15.04, wifi doesn't enable an internet connection. The interface connects to the router,however. I saw a similar question, where the solution was to delete two iwlwifi files - tried this w/out success. From lspci: 

00:15.0 Network controller [0280]: Ralink corp. RT2500 Wireless 802.11bg [1814:0201] (rev 01)

malcolm@PackbellLaptop:~$ iwconfig
wlan0     IEEE 802.11bg  ESSID:"WLAN-Osborne"  
          Mode:Managed  Frequency:2.437 GHz  Access Point: C0:A0:BB:C2:00:4E   
          Bit Rate=48 Mb/s   Tx-Power=20 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:on
          Link Quality=47/70  Signal level=-63 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

lo        no wireless extensions.

eth0      no wireless extensions.

malcolm@PackbellLaptop:~$ uname -a
Linux PackbellLaptop 3.19.0-15-generic #15-Ubuntu SMP Thu Apr 16 23:32:01 UTC 2015 i686 athlon i686 GNU/Linux
malcolm@PackbellLaptop:~$ lspci -nnk | grep -A3 RT2500
00:15.0 Network controller [0280]: Ralink corp. RT2500 Wireless 802.11bg [1814:0201] (rev 01)
    Subsystem: Ralink corp. RT2500 Wireless 802.11bg [1814:2560]
    Kernel driver in use: rt2500pci
00:18.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration [1022:1100]
00:18.1 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] K8 [Athlon64/Opteron] Address Map [1022:1101]
wlan0     Link encap:Ethernet  HWaddr 00:10:60:63:e0:3c  
          inet6 addr: fe80::210:60ff:fe63:e03c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:124 errors:0 dropped:0 overruns:0 frame:0
          TX packets:148 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:16911 (16.9 KB)  TX bytes:23073 (23.0 KB)
malcolm@PackbellLaptop:~$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         10.0.0.2        0.0.0.0         UG    1024   0        0 wlan0
10.0.0.0        0.0.0.0         255.255.255.0   U     0      0        0 wlan0
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 wlan0

Network manager syslog is at paste.ubuntu.com/10981489

A.B.
  • 92,125
Malcolm Osborne
  • 39

4 Answers4

2

With no IP address in ifconfig and no route details, it doesn't appear that you have connected to the router. However, syslog shows that you connect with no obvious and therefore fixable issues, but immediately disconnects.

First, check the settings in the router. WPA2-AES is preferred; not any WPA and WPA2 mixed mode and certainly not TKIP. Second, if your router is capable of N speeds, you may have better connectivity with a channel width of 20 MHz in the 2.4 GHz band instead of automatic 20/40 MHz, although it is likely to affect N speeds. I also have better luck with a fixed channel, either 1, 6 or 11, rather than automatic channel selection. Also, be certain the router is not set to use N speeds only; auto B, G and N is preferred. After making these changes, reboot the router.

Next, I recommend that your regulatory domain be set explicitly. Check yours:

sudo iw reg get

If you get 00, that is a one-size-maybe-fits-all setting. Find yours here: http://en.wikipedia.org/wiki/ISO_3166-1_alpha-2 Then set it temporarily:

sudo iw reg set IS

Of course, substitute your country code if not Iceland. Set it permanently:

gksudo gedit /etc/default/crda

Use nano or kate or leafpad if you don't have the text editor gedit. Change the last line to read:

REGDOMAIN=IS

Proofread carefully, save and close the text editor.

Next, I'd set IPv6 to Ignore in Network Manager: http://docs.fedoraproject.org/en-US/Fedora/18/html/Installation_Guide/images/netconfig/network-connections-ipv6-ignore.png This example is for ethernet, but you want wireless.

chili555
  • 61,330
1

Detect and install additional Ubuntu driver with ubuntu-drivers package.

Open a terminal Ctrl+Alt+T and type following:

sudo ubuntu-drivers autoinstall
Tim
  • 33,500
Salehi
  • 569
0

just in case try to set off power management:

iwconfig wlan0 power off
Vladimir Yavorskiy
  • 1
-1

It is possible that you have a conflict with the old driver for the previous version not working. Please backup all your data and do a clean install and report back if the issue has been solved.

Brask
  • 1,588