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After upgrading my 13.04 vm to 13.10 when I run my 13.10 vm all I get is a black screen with flashing _. I can alt f1-f6 to get into tty1-6 and I ran apt-get update & upgrade but still no luck.. When I try to run gui apps from the tty1 it states that GtkWarning: could not open display.

And when I type unity the error says no DISPLAY variable set, setting it to :0 unity-panel-service: no process found

Can someone help me to get unity working again?

The link you gave me did not fix the problem and since this is virtual machine i dunno which video card it is using

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marked as duplicate by Warren Hill, karel, Aditya, guntbert, Kevin Bowen Oct 27 '13 at 23:04

This question was marked as an exact duplicate of an existing question.

    
Could you then give more details? We don't know even what virtual machine you are using, if you don't tell us. Please add more details. – Braiam Oct 28 '13 at 2:58
    
Please tell us the virtualisation software you are using. – LiveWireBT Oct 28 '13 at 5:19

I faced something like that a few times but I never managed to make it work correctly however there is one thing that I didn't try 'sudo do-release-upgrade'.I hope that this helps you.

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