Vnc server

create VNC server on ubuntu

sudo apt install xfce4 xfce4-goodies
sudo apt install tightvncserver

vncserver -kill :1
# setup vnc initial config

vim  ~/.vnc/xstartup
# add
gnome-panel &
gnome-settings-daemon &
metacity &
nautilus &

# continue installation
sudo apt install -y gnome-panel gnome-settings-daemon metacity nautilus

chmod +x ~/.vnc/xstartup

vncserver -kill :1
vncserver -localhost

sudo apt install virtualbox
# install ext pack
sudo VBoxManage extpack install  Oracle_VM_VirtualBox_Extension_Pack-6.1.38-153438.vbox-extpack