ROS installation failed

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Hi !

I am trying to install ROS on a laptop in order to get it working with the Turtlebot2. I tried to install kobuki's packages thanks to this tutorial : http://www.ros.org/wiki/kobuki/Tutorials/Installation ; but something seems to have failed. First, I couldn't do this step :

roscd kobuki_ftdi 
make udev

The computer answered :

make: *** No rule to make target `udev'.  Stop.

And I might say that I am not really sure about what this step of the installation is for.

Then, if I tried to launch any launch file or script,

roslaunch kobuki_node minimal.launch

the computer answered that the package doesn't exist :

[kobuki_node] is not a package or launch file name

Although I did follow all the previous step with success (except the udev one).

As you suggested, I also tried http://www.ros.org/wiki/turtlebot/Tutorials/groovy/Installation I ran :

. /opt/ros/groovy/setup.bash
rosrun kobuki_ftdi create_udev_rules

and got this answer :

This script copies a udev rule to /etc to facilitate bringing
up the kobuki usb connection as /dev/kobuki.

[sudo] password for turtlebot: 

Restarting udev

udev stop/waiting
udev start/running, process 4208

But whenever I try to roslaunch a kobuki_package I still got the same error as above (and I need the auto_docking package). If I try to run a turtlebot's package,

roslaunch turtlebot_bringup minimal.launch

I got this error :

WARNING: unable to configure logging. No log files will be generated
Checking log directory for disk usage. This may take awhile.
Press Ctrl-C to interrupt
WARNING: disk usage in log directory [/home/turtlebot/.ros/log] is over 1GB.
It's recommended that you use the 'rosclean' command.

Cannot locate [roslaunch]Invalid <param> tag: Cannot load command parameter [rosversion]: command [rosversion roslaunch] returned with code [1]. 

Param xml is <param command="rosversion roslaunch" name="rosversion"/>

I don't know what went wrong and any hint about how to fix the situation is welcome.