Wifi not working in ubuntu

Question

My wifi is not working. The ethernet works well. Wifi also works in windows dual boot. Hence it isnt hardware problem. Please advice.

iwconfig
eth0      no wireless extensions.
lo        no wireless extensions.
wlan0     IEEE 802.11bgn  Mode:Master  Tx-Power=20 dBm  
Retry  long limit:7   RTS thr=2347 B   Fragment thr:off
      Power Management:off

dmesg | grep Wireless
[   14.639861] input: HP Wireless hotkeys as /devices/virtual/input/input6

lspci
00:00.0 Host bridge: Intel Corporation Broadwell-U Host Bridge -OPI (rev 09)
00:02.0 VGA compatible controller: Intel Corporation Broadwell-U Integrated Graphics (rev 09)
00:03.0 Audio device: Intel Corporation Broadwell-U Audio Controller (rev 09)
00:14.0 USB controller: Intel Corporation Wildcat Point-LP USB xHCI Controller (rev 03)
00:16.0 Communication controller: Intel Corporation Wildcat Point-LP MEI Controller #1 (rev 03)
00:1b.0 Audio device: Intel Corporation Wildcat Point-LP High Definition Audio Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #1 (rev e3)
00:1c.1 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #2 (rev e3)
00:1c.2 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #3 (rev e3)
00:1c.4 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #5 (rev e3)
00:1c.5 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #6 (rev e3)
00:1d.0 USB controller: Intel Corporation Wildcat Point-LP USB EHCI Controller (rev 03)
00:1f.0 ISA bridge: Intel Corporation Wildcat Point-LP LPC Controller (rev 03)
00:1f.2 SATA controller: Intel Corporation Wildcat Point-LP SATA Controller [AHCI Mode] (rev 03)
00:1f.3 SMBus: Intel Corporation Wildcat Point-LP SMBus Controller (rev 03)
00:1f.6 Signal processing controller: Intel Corporation Wildcat Point-LP Thermal Management Controller (rev 03)
02:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5229 PCI Express Card Reader (rev 01)
08:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller (rev 07)
09:00.0 3D controller: NVIDIA Corporation GF117M [GeForce 610M/710M/820M / GT 620M/625M/630M/720M] (rev a1)
0a:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter

lspci -knn | grep Net -A2
0a:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter [10ec:b723]
    Subsystem: Hewlett-Packard Company Device [103c:2231]
    Kernel driver in use: rtl8723be


rfkill list
0: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no
1: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no

ifconfig && iwconfig && route -n && ping -c 1 google.com
eth0      Link encap:Ethernet  HWaddr d0:bf:9c:0a:ce:7d  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:15178 errors:0 dropped:0 overruns:0 frame:0
          TX packets:15216 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:11868737 (11.8 MB)  TX bytes:1948892 (1.9 MB)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:1699 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1699 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:240328 (240.3 KB)  TX bytes:240328 (240.3 KB)

wlan0     Link encap:Ethernet  HWaddr 74:29:af:94:27:59  
          inet addr:10.10.0.1  Bcast:10.10.0.255  Mask:255.255.255.0
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:56 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:9877 (9.8 KB)

eth0      no wireless extensions.

lo        no wireless extensions.

wlan0     IEEE 802.11bgn  Mode:Master  Tx-Power=20 dBm   
          Retry  long limit:7   RTS thr=2347 B   Fragment thr:off
          Power Management:off

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
10.10.0.0       0.0.0.0         255.255.255.0   U     0      0        0 wlan0
ping: unknown host google.com

Please edit your answer with the output of the following commands (run them in a terminal window): iwconfig dmesg | grep Wireless. — Eduardo Cola, Feb 13 '16 at 13:53
Previous comment wants output of 'iwconfig' as one command, and 'dmesg | grep wireless' as second command. I would also add to provide the output of 'lspci' to help identify the actual wireless chipset that you are using. — karora, Feb 13 '16 at 13:58
Wireless works according to the outputs. The problem is with the router or AP, that does not set gateway. — Pilot6, Feb 13 '16 at 15:24
I'm Sorry I didnt get you. What should i do? I cant even see the connectio n name of my router in ubuntu. — doodle1234, Feb 13 '16 at 15:32
It looks like you created a new network for some reason. Or manually edited /etc/network/interfaces. — Pilot6, Feb 13 '16 at 15:38
I dont know whether i had edited it before. How can I unedit it? — doodle1234, Feb 13 '16 at 15:44
Please have a look at https://unix.stackexchange.com/a/593848/254422 — binarysta, Aug 21 '20 at 12:13

chili555 · Answer 1 · 2016-02-13T16:25:23.270

0

According to iwconfig, your device is set to Master mode:

wlan0     IEEE 802.11bgn  Mode:Master  Tx-Power=20 dBm   
          Retry  long limit:7   RTS thr=2347 B   Fragment thr:off
          Power Management:off

In order to connect to an access point, it should be set to Managed, also known as Infrastructure. Please click the Network Manager icon, select 'Edit Connections' and delete all previous connections. Then, under Wifi, select Infrastructure.

Then, check under IPv4 settings and under Method, select 'Automatic(DHCP)'; be certain it is NOT set to shared.

Save and close. Restart Network Manager:

sudo service network-manager restart

Now see if the NM icon sees your network and will connect.

It may take a reboot.

edited Feb 13 '16 at 16:25

answered Feb 13 '16 at 15:34

chili555

60,188

I suspect that OP made a new network instead of connecting to an existing one in NM. – Pilot6 Feb 13 '16 at 15:37
There is no connection by the current router in 'Edit Connections'. – doodle1234 Feb 13 '16 at 15:55
http://askubuntu.com/questions/106745/how-to-find-out-if-my-card-supports-infrastructure-mode – doodle1234 Feb 13 '16 at 15:59
from this it says my router doesnt support infrastructure mode. – doodle1234 Feb 13 '16 at 16:01
Please see my edit above in a few moments. I assume your card supports Managed mode. – chili555 Feb 13 '16 at 16:02
Still it doesnt connect to WIFI. I dont know whether it supports managed mode. – doodle1234 Feb 13 '16 at 16:09
Please tell us more. Does it see your network? When you click on it, does it try and fail? Does it scan? sudo iwlist wlan0 scan Or what are your symptoms? – chili555 Feb 13 '16 at 16:10
No. it doesnt see my network. I can only connect via ethernet. Wifi-Netwroks in NM is blinked to deactivated. – doodle1234 Feb 13 '16 at 16:12
'sudo iwlist wlan0 scan' says wlan0 : no scan results – doodle1234 Feb 13 '16 at 16:13
Does iwconfig now show mode:Managed ? – chili555 Feb 13 '16 at 16:19
No. it shows mode :Master – doodle1234 Feb 13 '16 at 16:19
Didn't you change it in Network Manager? Also, see a further edit above in a few moments. – chili555 Feb 13 '16 at 16:23
Once i deleted all my previous networks in 'Edit Connections' I cant see any 'wifi' tab to edit Master Mode'. Please advice – doodle1234 Feb 13 '16 at 16:27
Should i add a new 'wifi' connection? – doodle1234 Feb 13 '16 at 16:28
NOOOO! 'Add new connection' is for Master mode; setting up a hotspot. That's what's wrong now. Please try: sudo iwconfig wlan0 mode managed and then check: iwconfig Did it change to managed? Now does it scan? sudo iwlist wlan0 scan? – chili555 Feb 13 '16 at 16:32
now its showing managed mode. also sudo iwlist wlan0 scan revelaed lots of data. But still no connection to wifi. – doodle1234 Feb 13 '16 at 16:38
Excellent! Now does the Network Manager icon see your network? Can you click it and be asked for the WPA2 password and connect? – chili555 Feb 13 '16 at 16:40
No. NM still doesnt show the network. I cant seem to find the wireless network. – doodle1234 Feb 13 '16 at 16:42
If you walk the computer over very close to the router, does it see it then? When you scanned and saw lots of data was your network among them? Or just the neighbors or what? – chili555 Feb 13 '16 at 16:44
Comments are not for extended discussion; this conversation has been moved to chat. (feel free to ignore if you'd rather work here, but please flag for cleanup when you're done) – Seth Feb 13 '16 at 16:46
@chili555 wifi doesnt seem to work. please help – doodle1234 Mar 09 '16 at 16:14

Wifi not working in ubuntu

1 Answers1