[ubuntu] Struggling with ethernet problem for the past TEN days-Sporadic connection on 12.04

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http://ubuntuforums.org – The following is the situation: Laptop: Lenovo X200 Tablet Dual boot with Windows 7 and ubuntu 12.04 ethernet works perfectly on windows 7. Works sporadically on ubuntu 12.04. Tried getting a solution on IRC channel. No progress on that front either. I was suggested to live boot Ubuntu 12.10 to check if ethernet is working but the monitor blanks in the process and gets stuck. Bodhi.zazen says its a kernel issue. Can you suggest a procedure for diagnosis and solution? Laptop Specs Communications Fax/modem description 56K V.92 designed modem AMOM Fax/modem speed[3] 56Kbps data/14.4Kbps fax In (Hardware)