You reckon? Yeah, the OP has probably sold his PC by now after not being able to fix it. /sThis is a pretty old thread. Odds are good that OP has moved on and/or resolved the issue (one way or another).
But since the OPs question contained the most concise command to restore the xfce GUI I could find...
apt install xserver-xorg x11-xserver-utils xfonts-base x11-utils lightdm lightdm-gtk-greeter xfce4 xfce4-goodies xinit -y
... which helped me, I thought I'd repay in kind.
So, to add value to this forum and for the sake of future Googlers, the correct answer to the OPs question is:
startxfce4