When I was using Emacs in LXTerminal, I always had such a problem. The "Alt
+ some_key" combination could open up a LXTerminal menu. For example "Alt +
F" would open up the "File" menu of LXTerminal, instead of being a "Meta +F"
command in Emacs. In GNOME Terminal, I was able to disable "Alt" being a
shortcut key to terminal menu, but I could not do the same thing to
LXTerminal. Could anyone please help? Thanks.