Wired connection not detected (Worked nice on Beta)

  04:07.0 Ethernet controller: Broadcom Corporation BCM4401-B0 100Base-TX (rev 02)
        Subsystem: Dell Unknown device 01ed
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
        Latency: 64
        Interrupt: pin A routed to IRQ 19
        Region 0: Memory at fdbfe000 (32-bit, non-prefetchable) [size=8K]
        Capabilities: <access denied>

at bug #83143 someone told about:
disconnect network cable and re-plug it and then paste the result of a :
dmesg |grep link

and this is what i got:

[ 12.413843] audit: initializing netlink socket (disabled)

but without the grep help i can get the link up and link down information:

[ 1578.601659] e1000: eth0: e1000_watchdog: NIC Link is Down
[ 1587.888119] e1000: eth0: e1000_watchdog: NIC Link is Up 100 Mbps Full Duplex

maybe it's something setup wrong with the network-manager to get messages about link up and link down.

also it may be of some help:

WARNING: you should run this program as super-user.
7yr3n21.fln.com.br
    description: Computer
    width: 32 bits
  *-core
       description: Motherboard
       physical id: 0
     *-memory
          description: System memory
          physical id: 0
          size: 1003MB
     *-cpu
          product: Intel(R) Pentium(R) 4 CPU 2.00GHz
          vendor: Intel Corp.
          physical id: 1
          bus info: cpu@0
          version: 15.2.7
          size: 2GHz
          width: 32 bits
          capabilities: fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe up cid
          configuration: id=0
        *-cache:0
             description: L1 cache
             physical id: 0
             size: 8KB
        *-cache:1
             description: L2 cache
             physical id: 1
             size: 512KB
     *-pci
          description: Host bridge
          product: 82845G/GL[Brookdale-G]/GE/PE DRAM Controller/Host-Hub Interface
          vendor: Intel Corporation
          physical id: f0000000
          bus info: pci@00:00.0
          version: 01
          width: 32 bits
          clock: 33MHz
          resources: iomemory:f0000000-f7ffffff
        *-display
             description: VGA compatible controller
             product: 82845G/GL[Brookdale-G]/GE Chipset Integrated Graphics Device
             vendor: Intel Corporation
             physical id: 2
             bus info: pci@00:02.0
             version: 01
             size: 128MB
             width: 32 bits
             clock: 33MHz
             capabilities: vga bus_master cap_list
             configuration: driver=i810_smbus latency=0
             resources: iomemory:e8000000-efffffff iomemory:ff680000-ff6fffff irq:16
        *-usb:0
             description: USB Controller
             product: 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #1
             vendor: Intel Corporation
             physical id: 1d
             bus info: pci@00:1d.0
             version: 01
             width: 32 bits
             clock: 33MHz
             capabilities: uhci bus_master
             configuration: driver=uhci_hcd latency=0
             resources: ioport:ff80-ff9f irq:16
           *-usbhost
                product: UHCI Host Controller
                vendor: Linux 2.6.20-15-generic uhci_hcd
                physical id: 1
                bus info: usb@1
                logical name: usb1
                version: 2.06
                capabilities: usb-1.10
                configuration: driver=hub maxpower=0mA slots=2 speed=12.0MB/s
        *-usb:1
             description: USB Controller
             product: 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #2
             vendor: Intel Corporation
             physical id: 1d.1
             bus info: pci@00:1d.1
             version: 01
             width: 32 bits
             clock: 33MHz
             capabilities: uhci bus_master
             configuration: driver=uhci_hcd latency=0
             resources: ioport:ff60-ff7f irq:17
           *-usbhost
                product: UHCI Host Co...

Thank you for taking the time to report this bug and helping to make Ubuntu better. You reported this bug a while ago and there hasn't been any activity in it recently. We were wondering is this still an issue for you? Thanks in advance.

We are closing this bug report as it lacks the information, described in the previous comments, we need to investigate the problem further. However, please reopen it if you can give us the missing information and feel free to submit bug reports in the future.