I am getting the following error (or warning) when I run virtualbox and then when I make a new machine and reserve disk space (ver. 4.3.10-dfsg-1 with virtualbox-qt): VirtualBox .... Gtk-critical .... assertion 'GTK_IS_WIDGET (widget)' failed Aside from this appearing in the terminal screen after every step of the setup in the Oracle VirtualBox gui screen, the process seems to be going normally. Can the failure of this assertion be ignored? If not, can someone give me an apt-get recipe for installing all the packages that VirtualBox depends on? I have gotten as far as this using synaptic. I am trying to make a w32 win7 guest on this linux mint 17 laptop. There is no grub boot manager; it just starts in mint without any scrolling by of the startup process, vmlinuz et al. I bought the laptop (lenovo t400) without any MS OS installed. Thanks, Ed