Network Manager broken, faults upon boot

[as_dinnie]

Hi All

I am running Trusty on a Dell Laptop & have been doing fine for ages.

Recently I upgraded software, probably security upgrades, via Synaptic (cannot find out which ones) & now Network Manager always faults (multiple times) on system boot.
Result is I cannot get a network connection on this system.

The first fault for Network Manager is as follows (source: Kernel Log)

NetworkManager[844] general protection ip:469fee sp:7fffbd5b2240 error:0 in NetworkManager[400000+10d000]

This happens even before KDE gets loaded so does not appear to be KDE related.

I have tried different retro versions of Linux from the Bootloader & still no luck.
Ditto when running the Network option from "Rescue " version from the Bootloader.
Dpkg appears to indicate that the NetworkManager package is installed fine.

I can get networking running fine from Win8 on the same machine (which I am using now...) so the hardware appears not to be faulty.

I also also tried to get a previous version of Network Manager reinstalled under Synaptic but I cannot get far because there is no network connection!

So I am stumped.

Does anyone have any ideas that could help here please?
Its very frustrating having no data connection on my Linux install... and I do not enjoy using Windows.

Cheers, thanks

Andy

--

[as_dinnie]

Thanks Teunis

I'll a bash (puns not intended).

Cheers

Andy

[as_dinnie]

Still no joy

Hi Tounis

I had a bash (finally) at getting Kubuntu back online, using the commands in the listed post. Did not quite work

I find my network device but it does not seem to be running?
With a bit of a fiddle I can see the available networks but cannot connect to my ESSID (which is listed as being visible/available)

I am still getting no joy

Can you/someone please advise?

Thanks

Andy

--

Steps taken in the shell window:

1. Ran iwconfig

Result:

asd@asd-Dell:~$ iwconfig

eth0      no wireless extensions.

lo        no wireless extensions.

wlan0     IEEE 802.11abgn  ESSID:off/any       
Mode:Managed  
Access Point: Not-Associated   
Tx-Power=0 dBm      
Retry  long limit:7   
RTS thr:off   
Fragment thr:off
Power Management:on

So my Wireless is wlan0 but appears to be not working?

2. Ran iwlist

Result:

wlan0     Interface doesn't support scanning : Network is down

Not looking good....

3. Ran dhclient.

It started (?) but did not return to the bash shell (just stayed there) so I had to press Ctrl Z to come back to the shell prompt

4. Ran iwlist again ... now with a different result.

I got my ESSID showing up on the radar: "asd"

asd@asd-Dell:~$ sudo iwlist wlan0 scan | grep ESSID         
[B]ESSID:"asd"       [/B]        
ESSID:"ASUS88"                  
ESSID:"kittynet"                 
ESSID:"ASUS88"               
ESSID:"Apple Network f2d4b9"

Please note there was several minutes here so it should not be a time-related issue?

5. Ran iwconfig & wpa_passphrase again

asd@asd-Dell:~$ sudo iwconfig wlan0 essid "asd"
asd@asd-Dell:~$ wpa_passphrase "asd" "abcdABCD"
network={
        ssid="asd"
        #psk="abcdABCD"
psk=long string of characters}

NB I have changed my psk above to make it generic for this post.

Looks interesting, but I still get no connection...
I am tethering from my mobile phone so it tells me accurately that I am not connected...

-- end of steps taken

[as_dinnie]

Thanks Tounis.

Will try & see how I go.

Cheers

Andy