Make 'CTRL-/' behave the same in vtty and xterm

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http://unix.stackexchange.com – When I press CTRL-/ in a graphical terminal (e.g. xterm) I get "undo". However, in a virtual terminal (e.g. CTRL-ALT-F1) I get "backspace". In practice I run into this when I'm using emacs in a virtual terminal, probably debugging some X problem, and I try to use C-/ to undo but instead get a backspace. I believe I have experienced this on multiple computers over the years, so I don't think it's very specific to my current setup (ubuntu). (HowTos)