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Ubuntu 12.04 64-bit keeps freezing when using VMs [Using Lenovo ideapad g580 laptop]

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http://askubuntu.com – I'm having an annoying issue with my machine that I hope someone can help me with. My machine keeps freezing when running a VM under it. From what I noticed till now, it happens mostly when I save a machine state (~80% of the times are when I save a machine state, ~15% of the times are when I restore a machine state, and ~5% of the times are when I'm working on a machine). The OS I'm using is Ubuntu 12.04 64-bit (but I previously was using the 32-bit version and it happened there too). As far as for the guests machines, it happened with various of guest machines (Win7, Ubuntu, CentOs, Chromiu (HowTos)