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I have wireless Internet access and it worked well on Ubuntu 12.04 LTS until today, when I installed updates from the Update Manager. After the reloading of the computer the sign of Internet disappeared and the Internet connection stopped working.

I went to the Network section of the System settings and got such a message:

The system network services are not compatible with this version.

ping 8.8.8.8 gives the result Network is unreachable.

The solution offered by drewski22785 below have solved my problem!

Thanks to everyone who gave advices!

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up vote 4 down vote accepted

Roman,

I had the same issue, luckily I was able to figure out a fix. There appears to be an issue with the latest update of Network Manager. If you open the Ubuntu Software Center, go to History, search the keyword "Network" and you will probably see "network-manager (0.9.4.0-0ubuntu4, 0.9.4.0-0ubuntu4.1)".

If you see this then you have the same problem as I did. The solution is to downgrade to version 3: Search in Google "ubuntu network-manager package" and select the ubuntu.com link, then scroll down the page to "network-manager-dbg" select the precise (debug) ubuntu3 version.

http://packages.ubuntu.com/precise/network-manager-dbg

Download the 4 related packages for your system (amd64 or i386):

  • network-manager (= 0.9.4.0-0ubuntu3)

    • network management framework (daemon and userspace tools)

  • libnm-util2 (= 0.9.4.0-0ubuntu3)

    • network management framework (shared library)

  • libnm-glib4 (= 0.9.4.0-0ubuntu3)

    • network management framework (GLib shared library)

  • libnm-glib-vpn1 (= 0.9.4.0-0ubuntu3)

    • network management framework (GLib VPN shared library)

Install each of them using the command sudo dpkg -i FILENAME.

Restart your computer and that should fix your problem!

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Thank you very much, Drewski! I did what you said and it solved my problem! – roman sukhanov Jun 12 '12 at 11:33
    
oh, +1 for you @drewski22785, I followed and got my WIFI working now. And this is fresh brand new installation (12.04) - wifi was working during installation but after installation (and/or updates) it suddenly is not working. After all the steps above, I used wicd to configure my WIFI. – Peter Teoh Oct 13 '12 at 12:20
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OK, in a terminal, try the output from the commands ip add and ip route, and show us the context of /etc/network/interfaces.

The output from lsmod might also be useful.

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ip add: 1: lo: LOOPBACK,UP,LOWER_UP mtu 16436 qdisk noqueue state UNKNOWN link/loopback 00.00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft foreverpreferred_lft forever 2:eth0: BROADCAST,MULTICAST mtu 1500 qdisk noop state DOWN qlen 1000 link/ether f4:6d:04:81:89:23 brd ff:ff:ff:ff:ff:ff – roman sukhanov Jun 6 '12 at 22:01
    
3: wlan0: BROADCAST,MULTICAST mtu 1500 qdisk noop state DOWN qlen 1000 link/ether 48:5d:60:ad:1e:c6 brd ff:ff:ff:ff:ff:ff – roman sukhanov Jun 6 '12 at 22:04
    
Anders, hoppas du kan hjälpa mig! – roman sukhanov Jun 6 '12 at 22:13
    
/etc/network/interfaces: auto lo iface lo inet loopback auto eth0 iface eth0 dhcp – roman sukhanov Jun 10 '12 at 20:30
    
ip route: default dev wlan0 scope link metric 1003 169.254.0.0/16 dev wlan0 proto kernel scope link src 169.254.8.123 – roman sukhanov Jun 10 '12 at 20:36
up vote 0 down vote

Not sure about getting the tools working, but to get the network working as a workaround in the mean time you can try this.

Press Alt+F2 or open a Terminal window and run the following command:

gksu gedit /etc/network/interfaces

Add in here:

iface wlan0 inet dhcp
wpa-ssid enteryourssidhere
wpa-psk enteryourpassphrase

Save the file and close, then run the following commands in Alt+F2 or the Terminal:

sudo ifup wlan0
sudo dhclient wlan0

This presumes you are using private WPA/PSK.

This won't solve your long term problem but may get you connected at least.

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I tried an ethernet cable to conect to internet and I have the same problem as when I try wireless. my /etc/network/interfaces didn't help... and the network service is not compatible anymore with that version ... – roman sukhanov Jun 6 '12 at 9:18
    
but thanks for the advice, stueng – roman sukhanov Jun 6 '12 at 9:20
    
Ping 8.8.8.8 gave new result today: Ping 8.8.8.8 (8.8.8.8) 56(84) bytes of data. From 169.254.8.123 icmp_seq=1 Destination Host Unreachable – roman sukhanov Jun 10 '12 at 20:49

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