I installed xubuntu-desktop using tasksel on top of my default Ubuntu unity, but I can't find where the XFCE menu is. Here is a picture:

I installed xubuntu-desktop using tasksel on top of my default Ubuntu unity, but I can't find where the XFCE menu is. Here is a picture:

The XFCE-Menu you are talking about is called xfce4-whiskermenu-plugin. It is a plugin that lives in a xfce4 panel. So make sure you have xfce4 and the whiskermenu installed.
Go into the ubuntu software center and check if whisker menu is installed searching for it and see if there is a green check mark. If not install it.
Check if whiskermenu is installed
dpkg -s xfce4-whiskermenu-plugin
If not installed install it
sudo apt-get install xfce4-whiskermenu-plugin
If you have installed the package properly you should be able to add it to an xfce4 panel.
PanelAdd New Items..Whiskermenu should appear now in your panel.
If you want to edit the whiskermenu you need the package menulibre which is also available in the software center.
Installing it works like above
sudo apt-get install menulibre
or via the Ubuntu Software Center