Comment 1 for bug 696883

Tried the terminal:

~$ btnx-config
/usr/share/btnx-config/btnx-config.glade

(btnx-config:2727): Gtk-WARNING **: GtkSpinButton: setting an adjustment with non-zero page size is deprecated

(btnx-config:2727): Gtk-WARNING **: GtkSpinButton: setting an adjustment with non-zero page size is deprecated

(btnx-config:2727): Gtk-WARNING **: GtkSpinButton: setting an adjustment with non-zero page size is deprecated
Warning: configuration file for configuration "Default" does not exist. Deleting configuration.
Abandon

Then I tried:

~$ btnx
Le programme « btnx » n'est pas installé. Vous pouvez l'installer en saisissant :
sudo apt-get install btnx
(Meaning it's not installed and that I should get it)

So:

~$ sudo apt-get install btnx

New packages installed and then:

Starting btnx : Button Extension - mouse button rerouter daemon
 btnx: uinput modprobed successfully.
 btnx: Opening config file: /etc/btnx/btnx_config_Default
 btnx: Could not read the config file: No such file or directory
 btnx: Configuration file error.
btnx failed to start (error code 150) - try btnx-config

Hope I detailed enough...