nm-applet says no network, but system is connected

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We have instructions on debugging some types of problems at [WWW] http://wiki.ubuntu.com/DebuggingProcedures

At a minimum, we need:
1. the specific steps or actions you took that caused you to encounter the problem,
2. the behavior you expected, and
3. the behavior you actually encountered (in as much detail as possible).
Thanks!

Hello,

so for the minimum

1. the specific steps or actions you took that caused you to encounter the problem,
I only start my computer

2. the behavior you expected, and
I expect that it connect to the network, and little applet at the rigth top of screen, say, I'm connected.

3. the behavior you actually encountered (in as much detail as possible).
I add a screen copy, it show
"aucun périphérique réseau n'a été détecté"

Computer is connected, as I'm able to connect to web.
However, when I start firefox, the first time, it switch to offline mode, as is not able to find network.

I'm looking on wiki and try to add more information

I hope I'm clear,
Laurent

Based on this [WWW] http://wiki.ubuntu.com/DebuggingProcedures
and https://wiki.ubuntu.com/DebuggingNetworkManager

I have this
:
(gdb) bt
#0 0xb7f1f410 in __kernel_vsyscall ()
#1 0xb7cbebcb in poll () from /lib/tls/i686/cmov/libc.so.6
#2 0xb7d9ce7f in g_main_context_iterate (context=0x809bbc0, block=1,
    dispatch=1, self=0x8094548)
    at /build/buildd/glib2.0-2.16.3/glib/gmain.c:2951
#3 0xb7d9d1e7 in IA__g_main_loop_run (loop=0x809bc40)
    at /build/buildd/glib2.0-2.16.3/glib/gmain.c:2850
#4 0x0806b145 in main (argc=1918989871, argv=0xbffd98e4)
    at NetworkManager.c:1060

(gdb) bt full
#0 0xb7f1f410 in __kernel_vsyscall ()
No symbol table info available.
#1 0xb7cbebcb in poll () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.
#2 0xb7d9ce7f in g_main_context_iterate (context=0x809bbc0, block=1,
    dispatch=1, self=0x8094548)
    at /build/buildd/glib2.0-2.16.3/glib/gmain.c:2951
 max_priority = 2147483647
 timeout = -1
 some_ready = <value optimized out>
 nfds = 5
 allocated_nfds = <value optimized out>
 fds = (GPollFD *) 0x809e008
 __PRETTY_FUNCTION__ = "g_main_context_iterate"
#3 0xb7d9d1e7 in IA__g_main_loop_run (loop=0x809bc40)
    at /build/buildd/glib2.0-2.16.3/glib/gmain.c:2850
 self = (GThread *) 0x8094548
 __PRETTY_FUNCTION__ = "IA__g_main_loop_run"
#4 0x0806b145 in main (argc=1918989871, argv=0xbffd98e4)
    at NetworkManager.c:1060
 become_daemon = 1
 enable_test_devices = 0
 show_usage = 0
 owner = <value optimized out>
 pidfile = 0x80970c0 "/var/run/NetworkManager/NetworkManager.pid"
 user_pidfile = 0x80970c0 "/var/run/NetworkManager/NetworkManager.pid"
 __PRETTY_FUNCTION__ = "main"
(gdb)

and
(gdb) thread apply all bt full

Thread 1 (Thread 0xb7b1d720 (LWP 7379)):
#0 0xb7f1f410 in __kernel_vsyscall ()
No symbol table info available.
#1 0xb7cbebcb in poll () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.
#2 0xb7d9ce7f in g_main_context_iterate (context=0x809bbc0, block=1,
    dispatch=1, self=0x8094548)
    at /build/buildd/glib2.0-2.16.3/glib/gmain.c:2951
 max_priority = 2147483647
 timeout = -1
 some_ready = <value optimized out>
 nfds = 5
 allocated_nfds = <value optimized out>
 fds = (GPollFD *) 0x809e008
 __PRETTY_FUNCTION__ = "g_main_context_iterate"
#3 0xb7d9d1e7 in IA__g_main_loop_run (loop=0x809bc40)
    at /build/buildd/glib2.0-2.16.3/glib/gmain.c:2850
 self = (GThread *) 0x8094548
 __PRETTY_FUNCTION__ = "IA__g_main_loop_run"
#4 0x0806b145 in main (argc=1918989871, argv=0xbffd98e4)
    at NetworkManager.c:1060
 become_daemon = 1
 enable_test_devices = 0
 show_usage = 0
 owner = <value optimized out>
 pidfile = 0x80970c0 "/var/run/NetworkManager/NetworkManager.pid"
 user_pidfile = 0x80970c0 "/var/run/NetworkManager/NetworkManager.pid"
 __PRETTY_FUNCTION__ = "main"
#0 0xb7f1f410 in __kernel_vsyscall ()
(gdb)

Laurent

I think it's the same than
https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/191889

Laurent