I've just installed xubuntu 17.10 and cannot change xfce4-terminal keyboard shortcuts. I tried enabling editable accelerators (according to http://docs.xfce.org/faq), running:
Appearance -> Settings -> Menus and Buttons -> Enable editable accelerators: Tick
but when I hover the mouse over any menu item and press any key combination, nothing happens; I can see all shortcuts are greyed out, indicating that they can't be changed. I closed/reopened xfce4-terminal, and also logged out/in from the xfce session, to no avail, still can't change the shortcuts.
Don't know what changed in xfce because I remember being able to do this in past versions. I'm running fresh xubuntu 17.10, so xfce is version 4.12.3 and xfce4-terminal is 0.8.6-0ubuntu1.
Would anybody know how to change them ?
EDIT: I've just discovered that they can be changed editing:
~/.config/xfce4/terminal/accels.scm
Remove the leading ; from the menu entry and edit the shortcut. xfce4-terminal has to be closed/reopened for the new shortcuts to take effect. Not sure if this is the standard way of doing it, but at least it works.
EDIT 2: Found a good explanation about it here
Best Answer
As the solution was present in the question and in comments (along with contradictory statements) I will post an answer to make it more clear.
As said under Xfce bug report #12861 — "editable accelerators no more working in xfce4-terminal after GTK+3 migration":
That affects all later Xubuntu versions, not just 17.10.
While editing that file, as the OP said in the question, you have to
remove the lead(the;part at the beginning of the line); example for Ctrl-C for copy and Ctrl-V for paste: