up vote 3 down vote favorite

Running latest 14.04 plus all fixes up to and including 28th Jan 2016, all network connectivity gone on re-boot. My guess is it was the last lot of updates which where some lib files.

Installed files which might be the problem:

network-manager-gnome 0.9.8.8-0ubuntu4.4
libnm-util2 0.9.8.8-0ubuntu7.2.

It might be libnm-util was in the last update set but not sure. This is a very serious problem. How can I fix this without network connectivity?

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Why people keep answering this for wireless, when this is a problem about the wired connection? – Alfonso Nishikawa Feb 4 '16 at 21:45
up vote 1 down vote

It's an upgrade bug. As explained here, you have to downgrade some packages to have your network working again... Hope that Ubuntu Staff will solve the problem soon.

sudo apt-get install libnl-3-200=3.2.21-1 libnl-route-3-200=3.2.21-1 libnl-genl-3-200=3.2.21-1

It worked like a charm for me on Ubuntu 14.04. Hope that help. Rgds

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well to do this, we need a connection right? – ramgorur Jan 29 '16 at 22:40
    
Yes, but there is a way that worked for me: boot in rescuemode, choose network connection and then choose resume boot. Strangely enough I had a working network after that. Which in turn let me downgrade the packages :-) – thom Jan 30 '16 at 0:30
up vote 1 down vote

Same problem here (Ubuntu 14.04LTS)! Please notice, there is already a different thread #727127.

While this does not fix the problem, for me it helped to do a manual configuration of the wlan interface, e.g. to edit

sudo vi /etc/network/interfaces

I followed the example given here (see 3.2). The page gives some other information and additional steps, which were not necessary in my case.

/etc/network/interfaces:

auto wlan0
iface wlan0 inet dhcp
wpa-driver wext
wpa-ssid your_network_ssid
wpa-psk your_network_psk
# if your SSID is hidden, change value to 2
wpa-ap-scan 1
# type WPA for WPA1, RSN for WPA2
wpa-proto RSN
# type CCMP for AES, TKIP for TKIP
wpa-pairwise CCMP
# type CCMP for AES, TKIP for TKIP
wpa-group CCMP
# type WPA-PSK for shared key (most common), WPA-EAP for enterprise radius server
wpa-key-mgmt WPA-PSK

I simply adjusted the settings for wpa-ssid and wpa-psk followed by a reboot. With that, at least I got a working wifi connection back. And I can hope now for a fix, which I will be able to download, when it becomes available.

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Although your answer is 100% correct, it might also become 100% useless if that link is moved, changed, merged into another one or the main site just disappears... :-( Therefore, please edit your answer, and copy the relevant steps from the link into your answer, thereby guaranteeing your answer for 100% of the lifetime of this site! ;-) You can always leave the link in at the bottom of your answer as a source for your material... – Fabby Jan 29 '16 at 21:32
    
you need to restart the interface sudo service network-interface restart INTERFACE=wlan0 – ramgorur Jan 30 '16 at 0:48
up vote 0 down vote

you will need the ISO image of Ubuntu

Insert cdrom Ubuntu

Go to Unity Dash and look for Software & Updates

In the first tab Ubuntu Software, check the option of CD Rom with Ubuntu

Next is to go in Additional Drivers tab and select the propriety driver and click on Apply Changes

Once the drivers have been installed, you’ll see that Ubuntu now recognizes the wireless networks in range.

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1  
Thanks for that but it is not the lack of WiFi but of cable networking ie ethernet, I don't have WiFi on the machine. Prior to 28th Jan update (from ubuntu), cable networking worked, now it doesn't. Network Manager gui shows a red "X" and no devices. – tobiz Jan 29 '16 at 17:37
    
instal '' sudo apt-get install linux-headers-$(uname -r)'' next step "sudo apt-get install wpa_supplicant" networkmanager is the gui of wpa-supplicant – GAD3R Jan 29 '16 at 17:45
    
You can see if your wireless drivers are activated in the kernel and that your card is detected in Linux with the command: " ifconfig -a " – GAD3R Jan 29 '16 at 18:01
    
Packages updates on 28/29th (it was late) from: cat /var/log/dpkg.log include : libnl-3-200:amd64 3.2.21-1ubuntu1 libnl-route-3-200:amd64 3.2.21-1ubuntu1 libnl-genl-3-200:amd64 3.2.21-1ubuntu1 Are these the problem? – tobiz Jan 29 '16 at 18:03
    
we need collect info about wifi card and firmware – GAD3R Jan 29 '16 at 18:11

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