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**Teunis** · Feb 17, 2016, 02:23 PM

First off, Intel is typically well supported as are these T450s's.

I try to understand your problem.

Sometimes you can connect to WIFI, other times you cannot connect to WIFI, right?
When connected to WIFI sometimes you can access the internet, sometimes you cannot access the internet?
Or do you always get internet when connected to WIFI/

Are there some WIFI access points you can always connect and others you can never connect to or is the failure at random?

Is there a difference between a cold boot and after rebooting from Windows?

Can you execute the following commands:

Code:

iwconfig

It should (similar to what you already did) list at least two network sockets, lo and wlp3s0.
The wlp3s0 one will be followed by the name of the access point you are connected with.

If not try the next:

Code:

sudo ifconfig wlp3s0 up

Followed by:

Code:

iwlist wlan0 scanning

This last one should give a list of available WIFI access points

If so you should be able to connect using the usual network widget.

If you do get a list but are not able to connect via the network manager try these:

Code:

sudo iwconfig wlp3s0 essid ACCESSPOINT

Replace ACCESSPOINT with the name of your WIFI

Code:

sudo dhclient wlp3s0

This will set up DNS

In case of WPA:

Code:

wpa_passphrase YOURESSID YOURWIFIPASSWORD

Replace YOURESSID with the name of your WIFI
Replace YOURWIFIPASSWORD with, uhh, yes your WIFI password.

Try again:

Code:

iwconfig

And you should see wlp3s0 is connected.

Code:

ping google.com

Should show results.

Is so there is a problem with the network manager applet.

If still no connection it needs more investigation...

I start to think of a hardware failure but you stated the network always works in Windows...

**gnowak** · Feb 17, 2016, 02:45 PM

Thanks for your reply!

I can connect sometimes to some networks.

Let me try to explain.

1) My home networks I can always connect to, and I always get internet.

2) My Mobile hotspot i can connect to sometimes, but I never get internet.

3) Other networks I can't connect to at all.

I have been doing this for years, and it is the first time I have come across something like this. I should try to do a live-cd boot to an older version of Kubuntu maybe.

I tried to shut down and startup the computer a couple of times in Kubuntu only. And yes, I have a dual boot option with Windows 10, which is a pain, but I need it for some of my clients.

Her we go:

Code:

iwconfig
enp0s25   no wireless extensions.

lo        no wireless extensions.

Code:

wlp3s0    IEEE 802.11abgn  ESSID:"AndroidAP"  
          Mode:Managed  Frequency:2.462 GHz  Access Point: E8:50:8B:D2:09:D7   
          Bit Rate=78 Mb/s   Tx-Power=22 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=70/70  Signal level=-30 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:36   Missed beacon:0

Code:

iwlist wlp3s0 scanning
wlp3s0    Scan completed :
          Cell 01 - Address: E8:50:8B:D2:09:D7                                                 
                    Channel:11                                                                 
                    Frequency:2.462 GHz (Channel 11)                                           
                    Quality=70/70  Signal level=-30 dBm                                        
                    Encryption key:on                                                          
                    ESSID:"AndroidAP"                                                          
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s                       
                              24 Mb/s; 36 Mb/s; 54 Mb/s                                        
                    Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 48 Mb/s                                 
                    Mode:Master                                                                
                    Extra:tsf=000000002b9e6ebe                                                 
                    Extra: Last beacon: 5520ms ago                                             
                    IE: Unknown: 0009416E64726F69644150                                        
                    IE: Unknown: 010882848B962430486C                                          
                    IE: Unknown: 03010B                                                        
                    IE: Unknown: 2A0100                                                        
                    IE: Unknown: 32040C121860                                                  
                    IE: IEEE 802.11i/WPA2 Version 1                                            
                        Group Cipher : CCMP                                                    
                        Pairwise Ciphers (1) : CCMP                                            
                        Authentication Suites (1) : PSK                                        
                    IE: Unknown: 2D1A2D0017FFFF000000000000000000000000000000000000000000      
                    IE: Unknown: 3D160B081500000000000000000000000000000000000000              
                    IE: Unknown: 7F080400008001000040                                          
                    IE: Unknown: DD050016328000                                                
                    IE: Unknown: DD1E00904C0408BF0C3258810FFAFF0000FAFF0000C005000B000000C3020000
                    IE: Unknown: DD090010180201001C0000
                    IE: Unknown: DD180050F2020101000003A4000027A4000042435E0062322F00

Code:

wlp3s0    Link encap:Ethernet  HWaddr 5c:e0:c5:88:f3:a1  
          inet addr:192.168.43.184  Bcast:192.168.43.255  Mask:255.255.255.0
          inet6 addr: fe80::5ee0:c5ff:fe88:f3a1/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:8447 errors:0 dropped:0 overruns:0 frame:0
          TX packets:9125 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:7460775 (7.4 MB)  TX bytes:1710268 (1.7 MB)

Code:

ping google.com                                                                
ping: unknown host google.com

Code:

ping 192.168.43.184
PING 192.168.43.184 (192.168.43.184) 56(84) bytes of data.
64 bytes from 192.168.43.184: icmp_seq=1 ttl=64 time=0.018 ms
64 bytes from 192.168.43.184: icmp_seq=2 ttl=64 time=0.015 ms

Any hints and thoughts are very appreciated! Thanks again!

**Teunis** · Feb 18, 2016, 11:23 AM

Originally posted by gnowak View Post

Thanks for your reply!

I can connect sometimes to some networks.

Let me try to explain.

1) My home networks I can always connect to, and I always get internet.

2) My Mobile hotspot i can connect to sometimes, but I never get internet.

3) Other networks I can't connect to at all.

I have been doing this for years, and it is the first time I have come across something like this. I should try to do a live-cd boot to an older version of Kubuntu maybe.

I tried to shut down and startup the computer a couple of times in Kubuntu only. And yes, I have a dual boot option with Windows 10, which is a pain, but I need it for some of my clients.

Her we go:
<Snip>

Code:

wlp3s0    IEEE 802.11abgn  ESSID:"AndroidAP"  
          Mode:Managed  Frequency:2.462 GHz  Access Point: E8:50:8B:D2:09:D7   
          Bit Rate=78 Mb/s   Tx-Power=22 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=70/70  Signal level=-30 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:36   Missed beacon:0

This one shows you are connected to AndroidAP, that'll be the hotspot you have on an Android device.

Code:

iwlist wlp3s0 scanning
wlp3s0    Scan completed :
          Cell 01 - Address: E8:50:8B:D2:09:D7                                                 
                    Channel:11                                                                 
                    Frequency:2.462 GHz (Channel 11)                                           
                    Quality=70/70  Signal level=-30 dBm                                        
                    Encryption key:on                                                          
                    ESSID:"AndroidAP"                                                          
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s                       
                              24 Mb/s; 36 Mb/s; 54 Mb/s                                        
                    Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 48 Mb/s                                 
                    Mode:Master                                                                
                    Extra:tsf=000000002b9e6ebe                                                 
                    Extra: Last beacon: 5520ms ago                                             
                    IE: Unknown: 0009416E64726F69644150                                        
                    IE: Unknown: 010882848B962430486C                                          
                    IE: Unknown: 03010B                                                        
                    IE: Unknown: 2A0100                                                        
                    IE: Unknown: 32040C121860                                                  
                    IE: IEEE 802.11i/WPA2 Version 1                                            
                        Group Cipher : CCMP                                                    
                        Pairwise Ciphers (1) : CCMP                                            
                        Authentication Suites (1) : PSK                                        
                    IE: Unknown: 2D1A2D0017FFFF000000000000000000000000000000000000000000      
                    IE: Unknown: 3D160B081500000000000000000000000000000000000000              
                    IE: Unknown: 7F080400008001000040                                          
                    IE: Unknown: DD050016328000                                                
                    IE: Unknown: DD1E00904C0408BF0C3258810FFAFF0000FAFF0000C005000B000000C3020000
                    IE: Unknown: DD090010180201001C0000
                    IE: Unknown: DD180050F2020101000003A4000027A4000042435E0062322F00

Because you are already connected to AndroidAP you cannot do a scan.

<Snip>

Code:

ping google.com                                                                
ping: unknown host google.com

OK, either no internet or at least no DNS, you could try with:

Code:

ping 8.8.8.8

That's also google.

Code:

ping 192.168.43.184
PING 192.168.43.184 (192.168.43.184) 56(84) bytes of data.
64 bytes from 192.168.43.184: icmp_seq=1 ttl=64 time=0.018 ms
64 bytes from 192.168.43.184: icmp_seq=2 ttl=64 time=0.015 ms

This one I assume it's your router or the Android hotspot?
Because 192.168.xxx.xxx are local addresses.

Any hints and thoughts are very appreciated! Thanks again!

At the moment it looks like you are connected to the hotspot but maybe it doesn't process your network access.

Try the ping 8.8.8.8 to google's DNS server.

**gnowak** · Feb 19, 2016, 10:09 AM

OK, thanks for the answers! You are right, I can ping the DNS:

Code:

ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=52 time=47.4 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=52 time=52.1 ms

But why? Both ipv4 and ipv6 are set to automatic... hmmm

**Teunis** · Feb 19, 2016, 06:13 PM

Try this one one more time, it should set the DNS:

Code:

sudo dhclient wlp3s0

Now you should be able to ping google.com or anything else.
It might be the Android hotspot that's not behaving but I don't know how to check except with a different device.

If not we need a network guru...

PS,
Try by switching off IPv6, not all devices understand it and it can cause this sort of behaviour.
https://help.ubuntu.com/community/WebBrowsingSlowIPv6IPv4

Where it says nano you can use kate.

As the article states this is not a desirable fix but hey, if it works...

**gnowak** · Feb 20, 2016, 01:00 AM

Thanks for the help!

But it looks strange:

Code:

sudo dhclient wlp3s0
RTNETLINK answers: File exists
/etc/resolvconf/update.d/libc: Warning: /etc/resolv.conf is not a symbolic link to /run/resolvconf/resolv.conf

What is wrong with nano? :-) I love nano.

I followed the instructions to disable ipv6 and even choose to ignore ipv6 in the network settings, but ipv6 is still enabled and I don't have the dynamic name server information.

Code:

test -f /proc/net/if_inet6 && echo "Running kernel is IPv6 ready"
Running kernel is IPv6 ready

I miss Kubuntu 14.04, but I like the new applications here in 15.10. But it is quite buggy. I don't know if it is because of the laptop or because of the the new Kubuntu version.. hmm

**gnowak** · Feb 20, 2016, 01:10 AM

Just as a bonus information, I am unable to connect via bluetooth nor USB tethering. The bluetooth tethering shows up as Galaxy S6 Network, but the USB tethering is invisible. I understand why many users are afraid of this wonderful world of free software. ;-D (I have been using linux since the early 2000's).

**Teunis** · Feb 20, 2016, 06:35 AM

Good you like nano, it is very effective but not everyone likes to learn the controls.

One other idea, did you by chance install a firewall?

**gnowak** · Feb 20, 2016, 02:27 PM

Hmm I don't think I have installed a firewall. If I have, it was not intentional.

**Teunis** · Feb 20, 2016, 05:55 PM

Two other ideas.
1.
Now in the situation where you can ping 8.8.8.8 you can also try this address in a browser:

http://74.125.224.72/

It should give you the Google homepage without the need for DNS.

2.
Use a different network manager, it's called WICD and because it works differently it might be without the bug that's plaguing you.
You can find it in the repositories and if I remember correctly it will uninstall the regular network manager.

**gnowak** · Feb 21, 2016, 06:15 AM

1.
I can ping it:
ping 74.125.224.72
PING 74.125.224.72 (74.125.224.72) 56(84) bytes of data.
64 bytes from 74.125.224.72: icmp_seq=1 ttl=52 time=214 ms

In my chrome browser I get an error, because it tries to go to http://www.google.com/:

This webpage is not available
DNS_PROBE_FINISHED_BAD_CONFIG

2.
I followed the instructions here to install wicd and removed the network manager manually (https://help.ubuntu.com/community/WICD).

Code:

sudo apt-get remove plasma-widget-networkmanagement network-manager
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package 'plasma-widget-networkmanagement' is not installed, so not removed                                                  
The following packages will be REMOVED:                                                        
  network-manager plasma-nm tlp-rdw                                                            
0 upgraded, 0 newly installed, 3 to remove and 0 not upgraded.                                 
After this operation, 11,2 MB disk space will be freed.                                        
Do you want to continue? [J/n] j                                                               
(Reading database ... 394985 files and directories currently installed.)                       
Removing plasma-nm (4:5.4.2-0ubuntu1.1) ...                                                    
Removing tlp-rdw (0.8-1) ...                                                                   
Removing network-manager (1.0.4-0ubuntu5.2) ...                                                
Processing triggers for desktop-file-utils (0.22-1ubuntu3) ...                                 
Processing triggers for mime-support (3.58ubuntu1) ...                                         
Processing triggers for dbus (1.10.0-1ubuntu1) ...                                             
Processing triggers for man-db (2.7.4-1) ...

After reboot I connected to my different networks and none of them worked with DNS. Not even my wired connection. Hmm, I found my T430 and googled "Kubuntu 15.10 networking dns error". Found a page that suggested that /etc/resolv.conf needs to be populated and mine was not. I added "nameserver 8.8.8.8" in that file with nano ;-) and now everything works. I removed wicd and am back with the original network manager.

Thanks for your patience! Motivated me for this quick fix! Marking it as solved, even though it is probably not the right solution.

**gnowak** · Feb 21, 2016, 08:41 AM

Thanks Snowhog, yes it is exactly the same content as I found on my T430 running Kubuntu 14.04. I still don't understand why mine is not being populated automagically here in 15.10. :-/

Just for reference: resolv.conf 14.04:

Code:

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 127.0.1.1
search 208.122.23.23

resolv.conf 15.10 (I did not delete anything):

Code:

# Generated by NetworkManager
#added manually
nameserver 8.8.8.8

**Snowhog** · Feb 21, 2016, 08:42 AM

/etc/resolv.conf is not the file 'you' put the nameserver entry into. If you read the warning in that file:

# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN

resov.conf is 'generated' by another process. There is another file that you modify to put in the IP addresses of the DNS's you want to use. I don't remember what that file is (sorry), but others here will let you know which on it is.

**oshunluvr** · Feb 21, 2016, 08:46 AM

Adding to what Snowhog says, it's likely the your manually edited resolv.conf will be overwritten. Thus these two lines in that file:

Code:

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN

The "correct" way to add lines to resolv.conf is to create a file in /etc/resolvconf/resolv.conf.d/ named "tail" and add your edits in there. Next bootup, your changes should be present in /etc/resolv.conf

Announcement

WIFI only connects to network, but no internet [Wireless 7265 - Lenovo T450s - 15.10]

WIFI only connects to network, but no internet [Wireless 7265 - Lenovo T450s - 15.10]

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