/etc/matchbox/kbdconfig is in matchbox-window-manager 1.2-7ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# This is an example keyboard config file for matchbox
#
# You can edit this file or change per user by copying to
# ~/.matchbox/kbdconfig
#
# Se the matchbox manual for more info ( http://projects.o-hand.com/matchbox )
### Window operation short cuts
<Alt>n=next
<Alt>p=prev
<Alt>c=close
<Alt>d=desktop
<Alt>m=!matchbox-remote -mbmenu
### App launching.
<ctrl><alt>x=!xterm
<ctrl><alt>r=!rxvt
### App launching with startup notify
<ctrl><alt>e=!!gpe-calender
### windows style key shortcuts
<alt>Tab=next
<alt><shift>Tab=prev
<alt>space=taskmenu
<alt>escape=!matchbox-remote -mbmenu
<alt>f4=close
f11=fullscreen
### super should be a 'window' key, uncomment '#' if you have one.
#<super>d=desktop
#<super>r=!xterm
#<super>e=!!nautilus
### Special keys, likely probably only available on extended keyboards.
#App=!matchbox-remote -mbmenu
#Menu=!matchbox-remote -mbmenu
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