The default keybindings with xfce4 conflict with fundamental keyboard shortcuts in Emacs.
This is a known problem and has a straightforward solution.
We may want to consider documenting this in a BCE known problems list and/or just changing the default in the next BCE release since it is more likely to affect our community than a changed keybinding in the ibus system.
I first opened IBus ($ ibus-setup) and there I changed Ctrl<space> into
Alt<space>. I hope it won't destroy anything, but at least C-<SPC> now sets
the mark in emacs.
The default keybindings with xfce4 conflict with fundamental keyboard shortcuts in Emacs.
This is a known problem and has a straightforward solution.
We may want to consider documenting this in a BCE known problems list and/or just changing the default in the next BCE release since it is more likely to affect our community than a changed keybinding in the ibus system.
Details: http://lists.gnu.org/archive/html/help-gnu-emacs/2014-05/msg00282.html