Update installation.md

docs/installation.md

@@ -80,9 +80,9 @@ Follow the instructions on this [ROS tutorial](http://wiki.ros.org/melodic/Insta
 
 ```bash
 cd
-mkdir -p helena_ws/src
-mkdir -p helena_ws/rosinstall
-cd helena_ws/rosinstall
+mkdir -p ~/iri-lab/helena_ws/src
+mkdir -p ~/iri-lab/helena_ws/rosinstall
+cd ~/iri-lab/helena_ws/rosinstall
 wget -q https://gitlab.iri.upc.edu/labrobotica/ros/iri_ros_how_to/-/raw/master/rosinstall/iri_core.rosinstall
 wget -q https://gitlab.iri.upc.edu/labrobotica/ros/robots/helena/iri_helena_how_to/-/raw/master/rosinstalls/helena_common.rosinstall
 wget -q https://gitlab.iri.upc.edu/labrobotica/ros/robots/helena/iri_helena_how_to/-/raw/master/rosinstalls/helena_real.rosinstall
@@ -91,12 +91,14 @@ wstool init
 wstool merge -y -r ../rosinstall/iri_core.rosinstall
 wstool merge -y -r ../rosinstall/helena_common.rosinstall
 wstool merge -y -r ../rosinstall/helena_real.rosinstall
-wstool update -j 10
-rosdep install -q -y -i -r --from-paths .
+wstool update
+sudo rosdep init
+rosdep update
+rosdep install -yir --from-paths .
 source /opt/ros/melodic/setup.bash
 cd ..
 catkin_make
-echo "source ~/helena_ws/devel/setup.bash" >> $HOME/.bashrc
+echo "source \$HOME/iri-lab/helena_ws/devel/setup.bash" >> $HOME/.bashrc
 source ~/.bashrc
 ```