configuration file / resize

Hi guys I have this following configuration file and no errors occured except the font that is not fix yet. But I have an issue concerning the resize. I'm using the same one in Arch and it works perfectly but not with my ubuntu at work

I can't enter in resize mode, or precisely I can enter into but arrows keys or "j, k, l, m" have no effects on windows and I doesn't have the little red "r" in my status bar either.

The version I'm using is this one:

i3 version 4.1.2 (2012-01-27, branch "release-4.1.2") © 2009-2011 Michael Stapelberg and contributors

Do you have any ideas. Thanks

# This file has been auto-generated by i3-config-wizard(1).
# It will not be overwritten, so edit it as you like.
#
# Should you change your keyboard layout somewhen, delete
# this file and re-run i3-config-wizard(1).
#

# i3 config file (v4)
#

set $mod Mod4

# font for window titles. ISO 10646 = Unicode
#fOBont pango:DejaVu Sans Mono 10

# Use Mouse+$mod to drag floating windows to their wanted position
floating_modifier $mod

# start a terminal
bindsym $mod+Return exec terminator

# kill focused window
bindsym $mod+Shift+q kill

# start dmenu (a program launcher)
bindsym $mod+d exec --no-startup-id dmenu_run

# change focus
bindsym $mod+j focus left
bindsym $mod+k focus down
bindsym $mod+l focus up
bindsym $mod+m focus right

# alternatively, you can use the cursor keys:
bindsym $mod+Left focus left
bindsym $mod+Down focus down
bindsym $mod+Up focus up
bindsym $mod+Right focus right

# move focused window
bindsym $mod+Shift+J move left
bindsym $mod+Shift+K move down
bindsym $mod+Shift+L move up
bindsym $mod+Shift+M move right

# alternatively, you can use the cursor keys:
bindsym $mod+Shift+Left move left
bindsym $mod+Shift+Down move down
bindsym $mod+Shift+Up move up
bindsym $mod+Shift+Right move right

# split in horizontal orientation
bindsym $mod+h split h

# split in vertical orientation
bindsym $mod+v split v

# enter fullscreen mode for the focused container
bindsym $mod+f fullscreen

# change container layout (stacked, tabbed, default)
bindsym $mod+s layout stacking
bindsym $mod+z layout tabbed
#bindsym $mod+e layout default

# toggle tiling / floating
bindsym $mod+Shift+space floating toggle

# change focus between tiling / floating windows
bindsym $mod+space focus mode_toggle

# focus the parent container
bindsym $mod+a focus parent

# focus the child container
bindsym $mod+e focus child

# switch to workspace
bindsym $mod+ampersand workspace 1
bindsym $mod+eacute workspace 2
bindsym $mod+quotedbl workspace 3
bindsym $mod+apostrophe workspace 4
bindsym $mod+parenleft workspace 5
bindsym $mod+minus workspace 6
bindsym $mod+egrave workspace 7

bindsym $mod+underscore workspace 8
bindsym $mod+ccedilla workspace 9
bindsym $mod+agrave workspace 10

# move focused container to workspace
bindsym $mod+Shift+ampersand move workspace 1
bindsym $mod+Shift+aecute move workspace 2
bindsym $mod+Shift+quotedbl move workspace 3
bindsym $mod+Shift+apostrophe move workspace 4

bindsym $mod+Shift+parenleft move workspace 5
bindsym $mod+Shift ...