In all GTK apps I used to get the following warnings when run from terminal:
`menu_proxy_module_load': /usr/lib/virtualbox/VirtualBox: undefined symbol: menu_proxy_module_load (<unknown>:23888): Gtk-WARNING **: Failed to load type module: (null)
This error was received while running Virtualbox. Though, it seems just a warning and doesn’t really change anything in the application, it does make the terminal messy. I figured I could fix the problem by simply installing appmenu-gtk.
So, run the following command to fix the issue:
sudo apt-get install appmenu-gtk