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From: Javier <nospam@nospam.com>
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Subject: Re: Emacs doesn't set mark with C-<SPC> anymore after Xubuntu upgrade
	to	14.04
Date: Wed, 21 May 2014 22:18:52 +0000 (UTC)
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Try C-h l (view lossage) to view the keyboard input that emacs sees.
Possibly you need to remap the escape sequence with something like

(define-key function-key-map "\e[1;5A" '[C-up])


My advice is to use xterm instead of xfce-terminal.  It handles better
the passing of key combinations.