Thread: Wired network stopped working 12.04

hi all,

morning unplugged , moved router. when booted again, couldn't connect wired network desktop, doesn't have wireless. have tried several of suggestions on other threads in forums, met no success. here further information:-

code:

mark@mark-optiplex-gx520:~$ sudo lshw -c network    *-network         description: ethernet interface         product: netxtreme bcm5751 gigabit ethernet pci express         vendor: broadcom corporation         physical id: 0         bus info: pci@0000:02:00.0         logical name: eth0         version: 01         serial: 00:13:72:7a:98:84         size: 100mbit/s         capacity: 1gbit/s         width: 64 bits         clock: 33mhz         capabilities: pm vpd msi pciexpress bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation         configuration: autonegotiation=on broadcast=yes driver=tg3 driverversion=3.121 duplex=full firmware=5751-v3.44a latency=0 link=yes multicast=yes port=twisted pair speed=100mbit/s         resources: irq:16 memory:fe8f0000-fe8fffff

code:

mark@mark-optiplex-gx520:~$ ifconfig -a  eth0      link encap:ethernet  hwaddr 00:13:72:7a:98:84              inet6 addr: fe80::213:72ff:fe7a:9884/64 scope:link            broadcast running multicast  mtu:1500  metric:1            rx packets:28 errors:0 dropped:0 overruns:0 frame:0            tx packets:48 errors:0 dropped:0 overruns:0 carrier:0            collisions:0 txqueuelen:1000             rx bytes:11536 (11.5 kb)  tx bytes:11799 (11.7 kb)            interrupt:16     lo        link encap:local loopback              inet addr:127.0.0.1  mask:255.0.0.0            inet6 addr: ::1/128 scope:host            loopback running  mtu:16436  metric:1            rx packets:96 errors:0 dropped:0 overruns:0 frame:0            tx packets:96 errors:0 dropped:0 overruns:0 carrier:0            collisions:0 txqueuelen:0             rx bytes:7488 (7.4 kb)  tx bytes:7488 (7.4 kb)

code:

mark@mark-optiplex-gx520:~$ cat /var/log/syslog | grep -i network | tail -25  apr 21 13:39:42 mark-optiplex-gx520 networkmanager[2304]:    scplugin-ifupdown: end _init.  apr 21 13:39:42 mark-optiplex-gx520 networkmanager[2304]: <info> loaded plugin ifupdown: (c) 2008 canonical ltd.  report bugs please use networkmanager mailing list.  apr 21 13:39:42 mark-optiplex-gx520 networkmanager[2304]: <info> loaded plugin keyfile: (c) 2007 - 2010 red hat, inc.  report bugs please use networkmanager mailing list.  apr 21 13:39:42 mark-optiplex-gx520 networkmanager[2304]:    ifupdown: unmanaged devices count: 1  apr 21 13:39:42 mark-optiplex-gx520 networkmanager[2304]:    scplugin-ifupdown: (-1238357384) ... get_connections.  apr 21 13:39:42 mark-optiplex-gx520 networkmanager[2304]:    scplugin-ifupdown: (-1238357384) ... get_connections (managed=false): return empty list.  apr 21 13:39:42 mark-optiplex-gx520 networkmanager[2304]:    keyfile: parsing wired connection 1 ...   apr 21 13:39:42 mark-optiplex-gx520 networkmanager[2304]:    keyfile:     read connection 'wired connection 1'  apr 21 13:39:42 mark-optiplex-gx520 networkmanager[2304]:    keyfile: parsing vodacom default 1 ...   apr 21 13:39:42 mark-optiplex-gx520 networkmanager[2304]:    keyfile:     read connection 'vodacom default 1'  apr 21 13:39:42 mark-optiplex-gx520 networkmanager[2304]:    keyfile: parsing vodacom default ...   apr 21 13:39:42 mark-optiplex-gx520 networkmanager[2304]:    keyfile:     read connection 'vodacom default'  apr 21 13:39:42 mark-optiplex-gx520 networkmanager[2304]:    ifupdown: unmanaged devices count: 1  apr 21 13:39:42 mark-optiplex-gx520 networkmanager[2304]: <info> modem-manager available  apr 21 13:39:42 mark-optiplex-gx520 networkmanager[2304]: <info> monitoring kernel firmware directory '/lib/firmware'.  apr 21 13:39:42 mark-optiplex-gx520 networkmanager[2304]: <info> wifi enabled radio killswitch; enabled state file  apr 21 13:39:42 mark-optiplex-gx520 networkmanager[2304]: <info> wwan enabled radio killswitch; enabled state file  apr 21 13:39:42 mark-optiplex-gx520 networkmanager[2304]: <info> wimax enabled radio killswitch; enabled state file  apr 21 13:39:42 mark-optiplex-gx520 networkmanager[2304]: <info> networking enabled state file  apr 21 13:39:42 mark-optiplex-gx520 networkmanager[2304]: <warn> failed allocate link cache: (-10) operation not supported  apr 21 13:39:42 mark-optiplex-gx520 networkmanager[2304]: <info> (eth0): carrier on  apr 21 13:39:42 mark-optiplex-gx520 networkmanager[2304]: <info> (eth0): new ethernet device (driver: 'tg3' ifindex: 2)  apr 21 13:39:42 mark-optiplex-gx520 networkmanager[2304]: <info> (eth0): exported /org/freedesktop/networkmanager/devices/0  apr 21 13:39:42 mark-optiplex-gx520 networkmanager[2304]: <info> unmanaged device found; state connected forced. (see http://bugs.launchpad.net/bugs/191889)  apr 21 13:40:37  networkmanager[2304]: last message repeated 5 times

contents of /etc/network/interfaces:--

code:

auto lo  iface lo inet loopback

i have tried rebooting both router , pc, adding lines

code:

auto eth0   iface eth0 inet dhcp

to /etc/network/interface file, no joy. have dual-boot setup windows 7, hasn't been booted months. tested connection via windows, , following error:--

'local area connection' doesn't have valid ip configuration

if further information required please let me know.

in advance,
mark

i presume checked cable...

Forum The Ubuntu Forum Community Ubuntu Official Flavours Support Networking & Wireless [ubuntu] Wired network stopped working 12.04

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