Whisker menu missing

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.

Check if Whisker Menu is installed

Ubuntu Software Center way

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.

Terminal way

Check if whiskermenu is installed

dpkg -s xfce4-whiskermenu-plugin

If not installed install it

sudo apt-get install xfce4-whiskermenu-plugin

Add Whisker Menu to your XFCE4 Panel

If you have installed the package properly you should be able to add it to an xfce4 panel.

1. Right click the bar you have in your screenshot
2. Click Panel
3. Click Add New Items..
4. Search for whisker in your items and add it

Whiskermenu should appear now in your panel.

Edit Whisker Menu

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