I have purchased Lenovo G580,on 26th January 2013. I installed Windows 7 and Ubuntu 12.04LTS (32bit), but in Ubuntu it was not detecting the network connection. Because of this I wanted to install Ubuntu 12.10 LTS (64bit). This time it is not asking for the booting options, directly booting to Windows. I consulted a friend and we tried it for three times, and by this time the hard disk was crashed. I contacted the Lenovo service center people they changed the hard disk and tried the same installation procedure, it was also a failure. Finally they installed only Windows 7 gave back it to me.
So my request you to advise me that what I have to do to solve this problem, I dont know whether it is the problem with the laptop (Lenovo G580) or anything else. Please give me some solutions.