Setting the pen button to work

As written here, in 10.04 we don't use xorg.conf anymore. We use

gksudo gedit /usr/lib/X11/xorg.conf.d/10-wacom.conf

instead.
And what we do is, that we put Option "Button2" "3" under the section that is for the pen, like here:

Section "InputClass"
Identifier "Wacom serial class"
MatchProduct "Serial Wacom Tablet"
Driver "wacom"
Option "ForceDevice" "ISDV4"
Option "Button2" "3"
Option "TPCButton" "on"
EndSection

An alternative solution is to put the

# Custom wacom settings.
xsetwacom set 'Serial Wacom Tablet' 'Button2' '3'

lines into our .profile file, in our home directory. (it's a hidden file)