Click on the link below to see the ScreenPrint. You can observe the result of :map in the lower terminal, and my .vimrc on the right one
I only have two NERDTree plugins, so I highly doubt it's caused by internal keymapping conflicts. I don't have the alt key mapped to anything else. And I am doing it exactly as in the documentation :h alt
I already checked my Ubuntu default Keyboard Shortcuts in Settings -> Devices -> Keyboard Shortcuts
I would be happy if anyone gave me a hand on this
The best answer is this one here.
Long story short, vim expects alt-keys to sent in one form, but most terminals, such as gnome terminal which I assume you're using, send them in another form. There is no good way to change this. With terminal vim I decided just to not use them. You can successfully get the map to work, but you will have to deal with overlapping mappings, timeout issues, and broken macros/plugins which have no solution other than to simply not use certain functionality.
