Ubuntu installed OK but resolution is low and unchangeable

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http://ubuntuforums.org – Tuesday 6.5.2014 I thought I had already submitted this thread - but cannot find it. so here it is again. I installed Ubuntu 14.4 under VM on my ASUS laptop (Intel I7 8GB ram) both the the two boxes in the pre-installation phase were checked.. The are two screens , one Samsung and the inbuilt screen on the laptop. The screen setup (from Win 8.1) is that the Samsung display is active and the Laptop not. The install went well and Ubuntu runs - but I have a low screen resolution. Going to system settings--> display shows an unchangeable resolution of 640 by 480. Which is unsatisfactory. (Hardware)