this is what i did:
apt-get update
apt-get upgrade
apt install xfce4 xfce4-goodies
installed a video dummy https://unix.stackexchange.com/a/78156
x11vnc -storepasswd
sudo x11vnc -xkb -noxrecord -noxfixes -noxdamage -display :0 -auth /var/run/lightdm/root/:0 -usepw
i can now connect to my vps using TigerVNCViewer but as soon i connect i get a ubuntu screen wich says "failed to start session", i then enter my name and password and it says the same. what can i do?