The system network services are not compatible with this version

[jukka76]

Network is not working after the upgrade of Ubuntu 12.04 network manager and related packages.
First time happened already on June 2012, seems the problem still exists.

Error message in Network manager is "The system network services are not compatible with this version"

I needed to downgrade packages, Working versions below, later versions give the error
libnm-glib-vpn1_0.9.4.0-0ubuntu3_i386.deb
libnm-glib4_0.9.4.0-0ubuntu3_i386.deb
libnm-util2_0.9.4.0-0ubuntu3_i386.deb
network-manager_0.9.4.0-0ubuntu3_i386.deb
network-manager-dbg_0.9.4.0-0ubuntu3_i386.deb

Related thread and answer:
http://ubuntuforums.org/showthread.php?t=2001421
https://answers.launchpad.net/ubuntu/+source/gnome-nettool/+question/199450

System info:
Description: Ubuntu 12.04.2 LTS
Release: 12.04
Linux bogey 3.2.0-24-generic-pae #39-Ubuntu SMP Mon May 21 18:54:21 UTC 2012 i686 i686 i386 GNU/Linux

Motherboard is gigabyte GA-E7AUM-DS2H with Nvidia Geforce 9400 chipset with integrated network.
According to gigabyte website, network device is Realtek 8211CL chip (10/100/1000 Mbit)

# lcpci -v
00:0a.0 Ethernet controller: NVIDIA Corporation MCP79 Ethernet (rev b1)
 Subsystem: Giga-byte Technology Device e000
 Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 41
 Memory at e4187000 (32-bit, non-prefetchable) [size=4K]
 I/O ports at c800 [size=8]
 Memory at e4188000 (32-bit, non-prefetchable) [size=256]
 Memory at e4189000 (32-bit, non-prefetchable) [size=16]
 Capabilities: <access denied>
 Kernel driver in use: forcedeth
 Kernel modules: forcedeth

[jukka76 (jukka76)]

I had extra line in /etc/network/interfaces
MTU 9000

probably left from long a time ago in some older version of ubuntu, when interfaces were configured manually with ifup scripts.

Now I left only

auto lo
iface lo inet loopback

and network manager works now and network is started in startup.

[Christian Leutloff (leutloff-sundancer)]

I have had a similar issue.

I have a static eth0 configuration in /etc/network/interfaces.

After removing the corresponding lines, network-manager als Network Configuration works again (perhaps after a reboot).

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[ironstorm (ironstorm-gmail)]

as per the answers.ubuntu.com thread linked above. To solve this issue I had to manually renable "management" by editing /etc/NetworkManager/NetworkManager.conf as follows:

[ifupdown]
# managed=true
managed=true

[ironstorm (ironstorm-gmail)]

Sorry it was

[ifupdown]
managed=false

Changed to
[ifupdown]
managed=true

and restarted

[jakman (jkitchen2009)]

I realize this is an old thread but this issue persists even on ver 14.04.
I am trying to edit the /etc/NetworkManager/NetworkManager.conf to:

[ifupdown]
managed=false

Changed to
[ifupdown]
managed=true

I am unable to save the file however as it is a Root owned read only file. What do I need to do to access root files or change ownership?

Jeff

[jordan (jordan-b)]

I was just hit by this bug as well on 14.04LTS

[Daryl Tucker (daryltucker)]

Just upgraded and rebooted. Experienced this issue on 14.04. Tried previous kernel. Tried suggestions in this thread. Tried re-installed NetworkManager and all of its dependencies. The issue persists.

[Daryl Tucker (daryltucker)]

I was able to workaround this issue by following the instructions here: http://askubuntu.com/a/727462