In Ubuntu when I hovered my mouse over VirtualBox and held the ALT key, it was sent to VirtualBox OS.
However, in Lubuntu (LXDE), when I hold the ALT key, it wants to switch between desktops and I can't use the ALT key inside VirtualBox.
How do I disable/unbind the ALT in LXDE, so it works in the VirtualBox window?
Unlike Gnome - the keybinding and mouse binding is controlled by a configuration file created when you first login - ~/.config/openbox/lubuntu-rc.xml
Open the file:
leafpad ~/.config/openbox/lubuntu-rc.xml
search for
<context name="Desktop">
Just below this are the statements highlighted:
Replace A-Up with A-S-Up and A-Down with A-S-Down
Alternatively just delete the lines below if you no longer want any ALT key mappings.
<mousebind>....</mousebind>
You should be able to move between desktops with ALT+SHIFT and Clicking.
You will also note if you search for A-Up & A-Down there are various other similar mousebind XML tag situations where Alt and click are used - you could also think about changing these mappings to be consistent.
Save the file, logout and login to test the new key-mappings
