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[Entry]
"Use need to install xkbset (you can use the Synaptic Package Manager). Then see this blog post for the how-to.
Quoted from the blog post:
First, we need install an old accessibility extension to X which is called xkbset. In Ubuntu or Debian, just sudo apt-get install xkbset.
The original idea of this software is to provide support for people
who might not be able to use a mouse or keyboard so well, so it
enables things like MouseKeys (control the cursor with the numpad) and
StickyKeys (hit shift, lift off, type a letter, get a capital), and
SlowKeys (only register a keypress after a certain amount of time).
But we're going to use it to map a keyboard key to a mouse button with
MouseKeys.
First, we'll get rid of all the cursor-control stuff, so you can still
use your numpad. As root, edit the file
/usr/share/X11/xkb/compat/mousekeys and remove everything between
interpret.repeat= False; and // New Keysym Actions. Notice this maps
some new ""keysym"" actions below, specifically the one called
Pointer_Button2.
Next, we'll make a script to configure xkbset, to turn MouseKeys on,
to not turn it off after a period of inactivity, and to map a key of
your choice to middle-click. Here's my ~/.middle-click.sh:
#!/bin/bash
# set XKB layout
setxkbmap -layout us
# turn on mousekeys
xkbset m
# stop mousekeys expiring after a timeout
xkbset exp =m
# map keysym to other keysym
xmodmap -e ""keysym Menu = Pointer_Button2""
# this also works
# xmodmap -e ""keycode 135 = Pointer_Button2""
This maps the Menu key (it's between Right Alt and Right Ctrl on my
keyboard, looks like a menu with a mouse cursor) to mouse button 2,
which is middle click. Notice I can also use any other key on the
keyboard, by commenting out the keysym line, and using the keycode
line. Keycodes are different from keyboard to keyboard, so to get the
keycode of the key you wish to use, run xev in a terminal, push the
key you desire, and watch the terminal output.
For the Mac users, left-click is button 1, and right-click is button
3. If I was using a Mac, I imagine I'd map Right Command to Button2, and Right Option to Button3. I hope the right side of these buttons
has a different keycode to the left side. If not, I've read of people
using F11 and/or F12. man xmodmap will tell you how to use a modifier
like Cmd+F12 if you so desire.
Under Gnome, I use System -> Preferences -> Sessions to start this
script as I log in, so I don't have to worry about it again. Don't
forget to make your script executable with chmod +x ~/.middle-click.sh"
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