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I've recently installed Ubuntu 12.04 on an old laptop. When I log in, the wired connection is active for about a minute, during which time I can browse the web etc. After this it displays the message 'Wire disconnected' and the wired connection no longer works. The cable is fine - it always works again for a minute on restart.

I'm new to linux but have had a good browse through past posts and can't see any symptoms that match exactly or solutions which I can implement. I'm not sure exactly what details would help solve this but here are a few:

initially ifconfig brings up a reference to eth 0, but after the first minute (when the connection is broken) it does not

the ethernet line of lspci is: 02:06.0 Ethernet controller: Broadcom Corporation BCM4401 100Base-T (Rev01)

What other information would be useful?

Thanks

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